Develop Bugs

about to buy a power bank and need advise

Hi there ,
I'm about to order one in amazon in the next few minutes ,
can anyone recommend on a power bank of 9000-1000Mah?
in addition , if there's one that can be charged and discharged simultaneously.
price should be up to $40.
thanks for your help!

rotman253 said:
Hi there ,
I'm about to order one in amazon in the next few minutes ,
can anyone recommend on a power bank of 9000-1000Mah?
in addition , if there's one that can be charged and discharged simultaneously.
price should be up to $40.
thanks for your help!
Click to expand...
Click to collapse
I would recommend you get a 10000mAh once, you can search it on Amazon, get the high ranking and good reviews one.
Remember with the standard industrial design, you will expect to get 30% conversion loss, so with a 10k mah, you will be able to get 7k mah for charge.

Scroll down to power bank/battery reviews I posted here: http://forum.xda-developers.com/showthread.php?t=2192333

Here i listed some power bank +1000 mAh under $45
Anker® 2nd Gen Astro E3 Dual-Port Ultra Compact External Battery Portable USB Charger Power Bank
10000 mAh, $29.99
Anker® Astro E4 13000mAh Dual USB Portable Charger
13000 mAh, $33.99
Anker® 2nd Gen Astro3 12000mAh (4A Output) Portable Charger Triple USB External Battery
12000 mAh, $45.99
Hopes help
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HAVIT 5 Port Charger

Specifications:
“Efficiency: 40 Watt
Max output per USB port: 2.1A
Voltage: 5.2V
USB Ports: 5 ports
Max total output current: 8A”
Click to expand...
Click to collapse
I travel often and I tend to bring with me a heap of different devices, that often utilize USB to charge and therefore I decided to get this charger from Havit. Having a charger with 5 USB ports is super convenient compared to having 5 separate chargers to charge my phones, tablets and headphones.
It came in a quite stylish box made out of cardboard, and inside the box the charger and a power cord can be found. The power cord I got in this case was a british power cord, but I had to replace it due to that I’m in northern Europe.
The charger is made out of green plastic and is slightly rubberized, and it’s really small as well compared to other multi-port chargers I’ve used. It seems like Havit really have paid attention to the details, as this charger looks really nice.
The charger outputs a voltage of around 5.2V according to my XTAR USB power detector, and the amperage is at around 1,5A which is the max amperage on the Z3 Compact. I’ve measured it with many devices connected as well, and the voltage seems stable. The charger does not get hot while charging. There’s one thing that kind of annoys me a little bit is that my charger “coil whines”, but honestly it’s not very loud and it does not bother me a lot.
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JYuice Yu Power Bank now available

JYuice Yu Power Bank is now available at Snapdeal in two variants.
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Yu power bank is available in 5000 mAh & 10,000 mAh exclusively.
Yu has manufactured JYuice in grey color who’s charging time is approximately 4-6 hours.
Following are the key specifications of JYuice Yu 10000 mah power bank:
Brand : YU
Color : Grey
mAh : 9001-10000
Warranty : 6 Months
Input : 5V2A
Output Power : Output 1: 5V1A, Output 2: 5V2.4A
LED Indicator : Yes
Connectors : USB
Battery Type : Li-Polymer
Power Source : USB Adapter
Charging Time : 6 Hours
Following are the key specifications of JYuice Yu 5000 mah power bank:
Brand : YU
Color : Grey
mAh : 4001-5000
Warranty : 6 Months
Input : 5V1A
Output Power : 5V2.1A
LED Indicator : Yes
Connectors : USB
Battery Type : Li-Polymer
Power Source : USB Adapter
Charging Time : 3 Hours
The price of JYuice 10000 mAh power bank is 1099 and 5000 mAh yu power bank is available at 699 INR.
Read this post in its ORIGINAL FORMAT HERE

Charging speed

To power up, you consume Red Bull. But your phone just needs its adaptive fast charger. Rate this thread to express how quickly the Samsung Galaxy Tab S7 / S7 Plus can charge. A higher rating indicates that it charges extremely fast.
Then, drop a comment if you have anything to add!

I verified that the S7 will charge at the full 30W from a 30W Aukey PD 3.0 adapter (CC-A4). It will also charge at 18W from a QC 2.0 or 3.0 adapter. It is not currently possible, however, to limit the charge rate to less than 30W when using the 30W adapter, except by disabling fast charging altogether which reduces the charge rate all the way to 9W. The option to reduce the charge rate would be really helpful when using a more powerful adapter with a dock to ensure devices such as USB HDDs will get enough power to operate.

I got the official 45 Watt charger from Samsung. Charges the Tab S7+ from 10% to 100% in 1 hour 15 minutes.

using a QuickCharge 3.0 Charger from HTC takes 3h 30 Minutes to fully charge.
The Battery Already reaches 100% After 3 Hours... but there is a difference btween full and full.
Always uses 9Volts and around 1.6A, so it charges with 15W most of the time, which roughly is the limit of the charger.
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Activating the "Protect Battery " mode which limits to 85% Charging charges 20-15 minutes Faster.
Sadly this stupid Tablet battery saver shut down my Bluetooth Terminal app. so i only have the first 1hour.
i ordered the Samsung 45W QuickCharger. Should arrive in a few weeks

Question PPS charging characteristics and speed changed.

Hello, in the recent days I've come to notice that my p6p takes more time to charge (when charging with the same cable(factory cable), charger(pd3.0 pps) from the same battery percentage), it now need almost 3 hours to fully charge from 15 to 100% when it used to do it in 2ish. The data in the apps accubattery and battery guru confirm this, since I can compare the charge times in different charging sessions.
When inspecting the wattage and current draw while charging ( 15%-100%) I can see a clear change in max sustained wattage, from the usual with p6p 22ish watts now it only charges at 17ish. Th current is also decreased from 4.5 to 3.7 Amps (at 5v input read, I know that software readings can be off, like in this case, since pps doesnt do constant 5v 4.5A) still while using the same setup at the same temperature the behavior is different, Such difference can be observed in the current vs time graph from the battery guru app. More over the current doesn't stay constant, it fluctuates between 0 and some charging value all the time( the app constantly changes between charging and not charging) this can been seen in the graph, as the "now" graph is more pink that indicates the jitter in the current while the "before" one in more transparent and the current is constant.
Typical curve some months ago
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Typical curve now
Can this be a software issue or should I go and buy a new charger/ cable?
Has anyone else have encountered this behavior ?