Aftermarket batteries for i9250 review - Samsung Galaxy Nexus

I, like many of you, have been looking for ways to extend the battery life on the galaxy nexus. The particular route I have taken was to purchase some after market batteries off eBay. The intention was to purchase extra batteries and always have 1-2 fully charged ready to use when I'm out or when I'm planning to use the hotspot function extensively.
I hope by sharing my experience it helps at least some of you in choosing the right option. I will be updating this thread over the next week or so.
So here we go.
Capacity: 1900mAh
Brand: Unbranded
eBay item title: 2X 1900mAh Battery + Home Charger for Google Samsung Galaxy Nexus Prime I9250
Cost: $10 for 2 batteries and 1 charger
I have no relation to the seller, and to avoid any reasonable doubt, I'm not including any links to the item. You are free to buy or not from any sellers online.
The batteries came nicely packaged. The batteries fit perfectly into my i9250, standard cover, no modifications needed.
The charger is the slow type (i.e. overnight charger), and I had to leave the batteries in it for 5+ hours to reach full charge. This is a plus (to me) since slow charging is more gentle on batteries, but it does mean that you will probably want two chargers so the batteries can be charged in parallel if you are a heavy user.
Batteries didn't heat up noticeably during the charge.
After charging completed, I placed it in the phone and it showed 100% charge for 30+ minutes.
I have had it in the phone for four hours and with fairly heavy usage it's now down to 86%. For some reason my stock battery never seem to do this well, I would have been down to ~70% by now normally.
Update 1: I have used the batteries in a normal work day and here are the findings.
Aftermarket Battery 1: uptime 14 hours from 100% to 14%
Aftermarket Battery 2: uptime 10.5 hours from 100% to 16%
All in all I'm pretty happy with the results given the price and the fact that screen time was >5 hours in both cases, and that the OEM batteries performed similarly.
Update 2:
OEM battery: uptime 13.9 hours from 100% to 13%
So I guess that's it for now. These aftermarket batteries do seem to perform similarity to the OEM stock battery (sans NFC). I'd definitely recommend them, as personally I prefer carrying an extra battery over purchasing an extended one since it does add bulk and heft, and doesn't really double the run time unless you go for the 3500mAh category which is even bigger.
Feel free to ask me any questions, I will try my best to answer them here.

Great review, thanks.
This review was the decider for me whether or not I wait for the 2012 phones to come out, or get the galaxy nexus early - GN won hands down. I am about to order the same batteries from China; they're a lot cheaper than what my service provider has to offer!

They are indeed a good deal. Just one thing that I want to re-emphasize - NFC is not supported with these batteries.
I'm fine with this as Google Wallet is not available in Canada, but it is something you may want to consider.

I just got this charger and battery kit. USB charging on the charger is a nice addition. I'm testing these batteries now, but plan on only using them in an emergency, so it's a great deal.
Sent from my HP Touchpad running ICS

I'm interested in seeing reviews for this:
http://www.dealextreme.com/p/replacement-3-7v-2000mah-battery-for-samsung-nexus-i9250-127588?item=1
Anyone have this battery?

To the op: how many times did you cycle the batteries to get those numbers? I've cycled each of the two twice and I'm getting terrible life... 2h screen time and 5h total use. My oem battery gets at least double that
Sent from my HP Touchpad running ICS

EP2008,
After I received the batteries I just charged it using the supplied charger until the light turned blue. I didn't power cycle the battery or do anything special.
Let me re-run the tests again and see how they compare now.
5 hours total run time does seem very short.
I was running AOKP before and running LiquidSmooth + Franco kernel now, but I guess as long as we use the Samsung OEM battery as control it shouldn't matter.
Will report back in a few days.

ignign0kt, no I don't have this battery, but I'd be interested in a review as well.

I have purchased these same type of batteries for my vibrant and they were great. About same runtime as stock battery and I would carry 2 or 3 around with me at all times. They seemed to work a little better after a few full charge cycles. Only thing is they do not last as long as the OEM battery as far as the number of recharges. That being said I got around 9 months of daily charges out of them and by that time they start to get a little beat up and worn from hanging out in my pocket all that time any way. So I think its well worth it.... $10 every 6 months to a year I think is better than $80 for a 3500mAh battery to me. I never keep a phone more than 2 years so I might have $30 tied up in batteries over that time. And having 3 batteries to swap out I can easily make it over 24 hours away from an outlet.
I will be buying these soon for my GN. I just got it last friday so still breaking in the oem battery and will see how many "spares" I will need to buy for it in the next couple weeks.

So I cycled the batteries a few times and they are better, but still not close to three performance I get from the stock battery. I'm not to bothered by i though as these are really only for an emergency and would be rarely needed.
Sent from my Galaxy Nexus using Tapatalk 2

e
ignign0kt said:
I'm interested in seeing reviews for this:
Replacement 3.7V 2000mAh Battery for Samsung Nexus i9250
(link removed due to idiotic board software)
Anyone have this battery?
Click to expand...
Click to collapse
Hmmmm.... VERY interesting. Thanks for the link. I just ordered two, one for me and one for my wife.

I bought the 3800mah battery from eBay for less than $12. Don't really notice any difference at the end of the day. Extended have 12% and stock Samsung had 13% at 9pm. Unplugg at 8am
Sent from my Galaxy Nexus using xda premium

Related

So Ebay batteries?

So I know there are a couple of posts on here but I have found them a little hard to follow. I just got my captivate last sunday and on the stock 2.1 rogers rom I noticed that the battery life was very poor. Since then I am now running cog 3.01 i think and my battery life is now alot longer than before.
For the way I would like to use my phone It is still not enough for what would make me happy. my phone is unplugged at 6:00 am and when i get home by 5 it used to be dead but after "breaking in the battery" and the new rom i get home with about %15 percent battery.
I just bought a triple battery pack off of ebay for $10. these batteries are rated at 1500 mAh, the same as the battery that came with my phone. I am just wondering what I can expect from these batteries.
My plan is to drain two of them completely then leave them in my desk drawer(from what I have read if you plan on storing batteries they should be completely drained first) and use one of them plus my oem battery daily(until they start to lose performance). Again does anyone have any experience with a battery of the sort or any similar third party battery?
they are no where as good as samsung oem battery. even though it says 1500mah it is not or will drop drastically after a month or so of use...i've bought a lot of those batteries from ebay and they always like that even some other well known companies like Seidio do not compare with manufacture's batteries. the difference is usable capacity, oem batteries are around 95% compared to cheap chinese ones that are anywhere from 60-80%.
haha thanks that makes sense why they are so cheap, well i will probs by three new ones every months or so.
I have those ebay batteries. I bought the kit that comes with two batteries and an external charger for about $10.
The ebay battery is has about 60-70% of the power of the OEM battery. I have no real hard evidence just from using it for the past 2 months or so.
I am ok that it is does not last as long as OEM because it was only $10 and it came with the external charger. I love the external charger because it allows me to charge a spare battery while I keep one in my phone.
Saelee said:
I have those ebay batteries. I bought the kit that comes with two batteries and an external charger for about $10.
The ebay battery is has about 60-70% of the power of the OEM battery. I have no real hard evidence just from using it for the past 2 months or so.
I am ok that it is does not last as long as OEM because it was only $10 and it came with the external charger. I love the external charger because it allows me to charge a spare battery while I keep one in my phone.
Click to expand...
Click to collapse
I bought the same ensemble, with essentially the same results excepting perhaps that one of my replacement batteries seems to underperform with about 40% of OEM battery life.
That said, for $10... they're very handy as backups. They'll easily give you a few more hours in a pinch, which is essentially just what I was looking for. I really have no complaints in that respect.
The best strategy for battery life I've found is to buy a handful of wall adapters and position them in places you spend a lot of time at, and to develop a habit of plugging in when you're not moving around.
Sad but true, but mediocre battery life is just kind of a way of life for these (and really all) high-performance Android devices. Excepting getting an outsized and expensive battery replacement like the Seidio 3500 mAh that all but prevents use with many accessories and cases, a couple wall chargers and a car charger are effective if mildly annoying means of managing it.
These generic Hong Kong replacements are entirely effective as emergency supplements, but you'll find yourself preferring the OEM cell still.
Yep I mean for $20 I have two charges and 4 batteries so if I need to go without power , even if not a 100% match for the oem power, it is still damn cheap.
I also got one of these from ebay.
I got the 2x 1500mah batteries + Battery Charger combo.
I must say I am impressed. They are the same quality as my OEM battery. Its so convenient. I never have to run to a charger anymore. Just keep the spare battery in my car or wherever and just pop it in and carry on with my daily business.
When I get home, I just re-charge all the batteries. The Battery Charger even has an LED Light that tells you when its finished. "RED: while charging" and "BLUE: when finished". Charging takes about roughly 3 hours, (just like OEM).
Edit: Been using this for about a month so far. With no problems.. Its the best feeling. My phone is never plugged in anymore. And, I don't have to "pinch the settings" to make my phone last.
IE. lowering brightness to 10%, turning sync off, turning wireless networks off, etc.
HIGHLY RECOMMEND!
only crappy thing is??? I plan to sell this phone soon, when the Galaxy S 2 comes out, if the specs are good enough.
fluidd said:
I also got one of these from ebay.
I got the 2x 1500mah batteries + Battery Charger combo.
Click to expand...
Click to collapse
Would you mind posting the link or giving us the name of the exact vendor you ordered from?... I'm about to order the 2xbatteries and charger combo, but just want to make sure I get batteries that are half way decent. When I search on eBay I get about 20 vendors selling similar combos and given that in HK they're celebrating Chinese New Year... most won't fulfill orders until next week.
i wouldnt waste your money unless you just want an extra.
Like It
SEIDIO 3000mAh 3.7v
Plenty of power
@ Amazon, comes with new battery cover
Works like a dream $56.00
Easy to hold phone
HELL NO i'm not spending $56 on a battery

[Q] Is an extended battery / second battery a must?

So, my OG Droid was acting up and my upgrade wasn't due until late july so I decided to purchase a Droid X.
While, I don't have the phone yet, and it is used I was debating whether or not a second battery is necessary as I will have a car charger from my original droid. But, at the same time I have had a second battery with most of my phones for years. But, then again I will most likely be replacing this phone by Sept/Oct the absolute latest.
You might be able to get by on just one battery. It seems the DroidX has one of the best battery lives for Android phones. If you do buy another battery, I would suggest the extended battery. It adds only 1mm to the back of the phone and it gave me around 4-5 hours more battery life than the standard battery. Then you can always have the standard battery on backup if you need some extra juice at the end of the day.
thanks for the tip
On Rubix Focused I can get 24 hours of battery life with heavy use! I have been thinking of getting an extended battery though. It would just be convenient
I have an extended battery and carry the standard battery that came with the DX in my car just in case i ever need to swap..no biggie, convenient.
Hey, I used the BH6X from Motorola and gave me superb life. I got more that 20 hrs (using juice defender) from it. Im now reviewing the 3800mAh that I got off eBay on the X2 forums, you're welcomed to come by since this battery is for both x's. I didnt want to start a whole new thread here in the X forums.
http://forum.xda-developers.com/showthread.php?p=17751410#post17751410
it really depends how heavily your using your phone and what for
I have 2 Motorola BH5X Standard 1500mAh Batteries I keep on me for backup at all times, which, ever since my sister-in-laws wedding and a trip to disneyland has become the standard for me.
Turns out taking a butt load of pictures and helping my wife manage the people at a wedding required a total of 3 batteries for my phone
Meanwhile, taking a lots of pix at Disneyland with no readily available outlets for my external charger also made 3 batteries the perfect number, especially after recording those late night light shows.
On a regular day though I can stretch out a single battery if I have an outlet for charging nearby or 2 batteries without a charger.
and yeah, I don't restrict data either so that does a number on my charge.
I get around 30 hours on the standard battery but I work from home, doesn't get two hours of streaming use on the way to and from work anymore. When I was driving two hours I would charge it every afternoon on the way home depending on the previous nights use. I also picked up a xoom so I use the phone a lot less now.
Sent from my Xoom using Tapatalk
kafreeman said:
I get around 30 hours on the standard battery
Click to expand...
Click to collapse
I am LUCKY to get 7 hours... I had to get a 2nd battery!
I ended up buying a second battery from Amazon for like 5 dollars and a cheap charger for the battery. Anytime I know I'm going to be out for awhile I take the extra battery. It has saved me a bunch of times.
If you're playing games or streaming movies a lot then I would def get one. With moderate use, I get at least 12 hours on mine

			
				
I would advice to replace a factory battery with an extended battery.
This one for instance is 3600mAh Extended Battery by Mugen, at least twice the capacity compared to factory battery. Reliable brand as well.
http://www.mugen-power-batteries.co...y-for-motorola-droid-x-with-battery-door.html
I would recommend one if you use your x constantly more than 4 hours in a single use.
Sent from my DROIDX using xda premium

i9003 Mugen 1700mah battery for Vibrant.

Just bought one of these intending to replace my stock 1500mah battery. $42 and free shipping from Mugen's website. Will let you all know if it delivers!
http://www.mugen-power-batteries.co...ended-battery-for-samsung-galaxy-s-i9003.html
kaintfm said:
Just bought one of these intending to replace my stock 1500mah battery. $42 and free shipping from Mugen's website. Will let you all know if it delivers!
Click to expand...
Click to collapse
What is the difference between the batteries in our phone and the 9003 ? Mugen has a 1600 listed for our phones.
Let us know if it fits . Thanks .
Oh sweet man please let me know how it goes. I am either going to do that or get the nice big fat one with the stand
I just bought a generic 3500MAH battery for the Vibrant off Amazon for $15. No regrets so far.
You can get the Momax 1700mah battery for $17 from ioomobile or $19 from ebay. Both with free shipping
I use an original vibrant battery in my i9000 too so the momax will fit the vibrant/i9003.
Please, tell me how are your results. I want to have a battery with more capacity but using the same back case.
Just waiting on its arrival now. I looked into other brands, but kept finding massive amounts of negative reviews, like the Momax battery.
Like from this thread: http://forum.xda-developers.com/showthread.php?t=478270
I actually had the Touch HD version, which worked perfectly fine for me Which was why I had no issue buying it for the i9000. I have been getting around 40 hours from light/minimal usage on the MIUI.us rom. I am getting around 30-35 hours on the standard i9000 and vibrant batteries.
I also bought one of the cheap 3000mah ebay batteries but didn't have any luck with that. I was getting around 45-50 hours but after a few recharges it dropped to less than the original battery.
I firmly believe in "you get what you pay for" however I have to say I have not had any problems with the momax battery so far, touch wood.
Was it delivered? My battery is worse every day even with Bi-Winning v3 with Bullet kernel. It dies too quick! Using WCDMA with HSDPA is the same as seeing my battery % going down realtime.
Enviado desde mi SGH-T959 usando Tapatalk
There are a couple things you can do to stretch battery life without too much compromise.
First, go with a black background. There's a free app on the market that's easy to miss. Do a search for blackwallpaper, all one word. AMOLED screens love darker colors when it comes to battery usage.
Second, get a 2g/3g toggle and switch to 2g when you don't need data and are primarily just texting or playing games.
Pick up the Bali-X kernel. Lots of battery saving goodies in there. Afterward, pick up SetCPU and reduce the voltages as far as you can without getting crashes or "sleep of death" issues.
Now, even when gaming, my battery isn't too stressed, and when I left it off the charger overnight, after 9hrs it had burned through a miserly 4% battery.
Finally, get a retractable usb data/charging cable. Can be had for a penny plus a couple bucks shipping. Retractable means easily pocketable, so whenever it occurs to you, break it out and connect your phone into whatever PS3, TV, Computer, or Laptop is available that has a USB slot.
The battery hasn't arrived yet. Supposedly takes as much as two weeks. I'm waiting with baited breath!
Woohoo! The battery has arrived and is on the charger as I type. Will have photos and whatnot after I've gone through the initial charging and discharging.
What I can say for certain is that the I-9003 battery fits perfectly into a standard Samsung Vibrant. No issues whatsoever.
Thanks, dude, for your info! I would be going to the shop to get one if you review it positively. I think I will have the "Purchase" button under the mouse arrow!
http://www.fonearena.com/blog/41082/mugen-power-battery-review.html
http://techie-buzz.com/mobile-news/mugen-battery-review-samsung-galaxy-s-htc-desire-z.html
http://androidforums.com/htc-hero-sprint/27678-mugen-power-1800mah-review.html
Funny quote from the second review, "These third party batteries come in two flavors – one without an extended back cover and another one with a back cover, which usually adds a couple of inches thickness to the phone."
Could you imagine if it was a couple of INCHES of thickness? It'd be almost as thick as it is wide
Doing a battery drain test now. Had my phone's screen on nonstop for 2hr30min, and the battery is down to 84% (though probably slightly inaccurate still). Will see how it fairs after I've charged and discharged it a few times. No, not from 100% to 0%. From 100% to 20%. Don't want to kill my battery.
Day 2, barely used my phone today, and it's at 84% with 18hrs of time away from the charger. Screen on time of only 16 minutes. The battery is definitely lasting longer, so I think I can safely say that this is a legitimate 1700mah battery. The real test will be how well it works after a few weeks, though I have high hopes.
I've just ordered mine! It won't ship until august, the 8th.
How is it going with your battery? Doest it last noticeably more?
Enviado desde mi SGH-T959 usando Tapatalk
Just lasted over 48hrs on one charge with light use. Mostly texting and some very brief gaming and market updates. Wifi and bluetooth were on the entire time. I'm definitely seeing a noticeable improvement in battery life.
Sent from my GT-I9000 using XDA Premium App
Added link to the battery and website. I feel like the 1700mah is a little conservative on their part. It feels like I'm getting more battery than the rated 200mah difference would allow. Anyway, loving the purchase, and no issues so far. Will keep everyone posted if it suddenly bursts into flames, or bakes me a pie.
http://www.mugen-power-batteries.co...ended-battery-for-samsung-galaxy-s-i9003.html
Thanks for posting your results.
I've been having trouble getting my battery to last more than 24 hours. :/
Though the latest releases of CM7 seem to be the problem. I was getting 24 hours easily with other roms..
So this 1700mah battery fits in the vibrant with the original back cover?
burntrat said:
So this 1700mah battery fits in the vibrant with the original back cover?
Click to expand...
Click to collapse
Yep! Using the original that came with my Vibrant. Fits perfectly.

Anker 1800mah on Amazon

http://www.amazon.com/Anker-Batteri..._26?s=wireless&ie=UTF8&qid=1316372694&sr=1-26
Read an article in the HTC Sensation forums where many of the posters picked up an Anker battery as a "Why the hell not for $15?" deal and had generally positive results. Did a search and not only does Amazon sell multiple varieties of Anker batteries, but many of them have a ton of positive reviews.
Before all the battery naysayers jump in and shout "You can't get an extra 300mah in a stock battery! It's another chinese scam and it's probably only 1.03mah!" the Sensation people explained it as being noticeably thicker than the stock battery while still fitting snugly inside the battery door. A good 1mm thicker at least.
Anyway, bought myself a pair along with a car charger for $30 for two batteries, a car charger, and a USB charger. Will let you all know if its a huge letdown, or if the positive reviews aren't just Chinese robots blowing smoke up our you-know-what.
Hey can you do a favor? Install battery calibration app from market and tell us how many mV (Milli volts) it say when the phone is truly 100% charged.
interested in seeing how those batteries are
was about to buy one
keep us posted
I've read in some of the comments on Amazon that they work best when the wall charger is used, though that may be because the wall charger keeps it at 100% while charging inside the phone causes the battery to drain down to 90% if left on the charger after it reaches 100%. Of course, the battery monitor won't tell you that to keep Samsung's support lines from clogging.
Thankfully this is Amazon and not the overseas shipping I had to deal with with my last battery, so it should arrive (according to Amazon) somewhere between the 23rd and 28th. Will test it heavily with my current ROM and let you all know how it fairs.
rakeshchn said:
Hey can you do a favor? Install battery calibration app from market and tell us how many mV (Milli volts) it say when the phone is truly 100% charged.
Click to expand...
Click to collapse
mV will not tell you anything about the capacity of a battery, only how close to fully charged it is.
Sent from my SGH-T959 using XDA App
shrapnelx said:
mV will not tell you anything about the capacity of a battery, only how close to fully charged it is.
Click to expand...
Click to collapse
True. If it's anything like the stock or mugen battery that I have, it'll cap out around 4250 for Froyo, 4200 for MIUI/Gingerbread.
Momax 1700mah is fine and chip.
Well, while discharging the first battery through normal use, I was actually getting a little frustrated that it was taking so long. Got about 24hrs out of it from wall charge to phone shut off, including about 8 - 9hrs of overnight standby.
Got the second battery off the charger and into the phone, and after about an hour it's still showing at 100% and 4100 - 4180ish millivolts.
Anyone, nothing is decided just yet. Will have to see how they hold up after the first 5 full charge and discharges that "sets" the batteries internal memory. Or whatever.
I thought these AOSP ROMS were supposed to drain battery, dammit!
Just about done "Breaking In" the new batteries. Two things: On the surface, they seem to last quite a while given the last time I tested the Mugen battery I was on Froyo and I'm now on MIUI.
From what I've heard, Gingerbread on the Vibrant, whether it's an i9000 leak like Malice or built from the ground up like Cyanogen 7 or MIUI, tends to burn battery faster than on Froyo. I'm also using different voltage settings, a different kernel... you all get the idea.
Apart from flashing back to Froyo, or completely redoing tests on my stock and Mugen batteries on top of the new Anker battery, whatever results I get will be a bit skewed.
Also, MIUI seems to allow the battery to get further down in power before shutting it off. Froyo would often cut me off around 3700, but I usually see MIUI showing battery power as low as 3300 before shutting down.
Your link points to the 2x package...if you look up the batt itself and read the reviews, most will tell you it's basically a cheaper oem replacement
http://www.amazon.com/Anker-1800mAh..._1_5?s=wireless&ie=UTF8&qid=1317360583&sr=1-5
Still a great deal at 11 bucks shipped.... by itself...and assuming it lasts...my original batt that came with my phone died couple of weeks ago... (less than 2hrs on a froyo rom...) had another oem that I'm using now..so far so good, but who knows...this seems like a great buy, but doesn't sounds like it's any kind of gain even with the 1800mAh rating...
Samsung Galaxy SII Touch batteries work in our phones. Tested.
They are 1800mah and can be found for $23 shipped. They are GENUINE Samsung as well so...it WILL be the advertised 1800mah. Just saying.
Even cheaper on ebay : http://www.ebay.com/itm/330601629006?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649
Sofiz has the Pisen battery for SGS II 1659 mAh, will this work on the Vibrant?
just ordered one too, hopefully it works out
Some reviewers saying battery only charges with wall charger and phone shows unsupported battery message. Those who have the battery please confirm.
adityamunshi said:
Some reviewers saying battery only charges with wall charger and phone shows unsupported battery message. Those who have the battery please confirm.
Click to expand...
Click to collapse
I think I went over that at least 3 times already. Battery is a perfect fit. Charging is perfect (USB computer and Wall plug in). EVERYTHING WORKS with it. I wish people would read the topic more. It's only 2 pages. . .
Only reason it wouldn't charge in your phone is if you owned a Fascinate, in which case, get out of our forums, punk!
Ordered one from ebay and pretty happy with it so far. Only had it a couple days so far though and still messing around with different roms and kernels so hard to say exactly how long of a charge i get with it.
Got mine today, charging now. Thanks!
Just recieved mine from amazon, and so far its been great !
I bought the two off of ebay that come with the wall charger. I'm getting much improved battery life right now. I'm very happy with them. Even though they do make the phone slightly heavier, it's worth it IMHO.

Need a good extended battery for GS3

I'm looking for a reliable extended battery for the GS3, I need some direction on where I can find good quality.
Sent from my SPH-D700 using xda premium
There was a post on a 4800mah battery and it was not much better than the original only about 30 minutes if I were you I would buy another oem battery to carry in your pocket thank me if I helped!
Sent from my Samsung Galaxy S III using Tapatalk 2
there's a couple threads on Anker batteries on here. some people are saying theyre just as good as OEM, maybe a little better.
I bought 1 and it just came in the mail today. Im gonna run it a few days and see how it goes.
also, I was close to buying 3x 2100 mah batteries + wall charger on ebay for like $13, but decided to go with the Anker batteries
Did the one you just buy 4800mah?
Sent from my SPH-D700 using xda premium
Hyperion extended battery for Galaxy s3
I have purchased a Hyperion 4000mah extended battery for the GSIII and I justed received it today. It is the second I purchase with the original being for my Droid Charge and I never had trouble including for the charge the longest it lasted me was 26hrs on a single charge it's the longest I remember and it was the second charge. The important thing is you must follow the instructions, when you first receive it put it on and use it with the charge the battery already has until it completely drains and then charge it for a full 12 hours. For five consecutive times use it til it completely drains and unplug when it reaches a hundred percent and it will last you for a very long time. So far for my extended battery received today it had 67% right out of the package and it has been in use for 8hrs with my wifi on and used moderately and still has 31% power. One more thing, they come with a back cover for the battery and the battery is actually 4200mah 19.99 plus 5.58 shipping and it ships free if you spend and extra 5 bucks on something else. Good luck.

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