Am I calculating this right? 25600mAh Power bank Capacity test

Hi,

I have recently bought a Li-Polymer power bank which has a rated capacity of 25600 mAh @ 3.7V or 94720mWh. Now, I have been testing this power bank using a 1A and 2A load. Here are the readings I got whilst charging and discharging the power bank.:

All readings are at 5V. The powerbank was charged at 2A and discharged at 2A or 1A USB resistor load.

and this was used to record mAh


Here's the readings:
Charge: 24897mAh
Discharge: 16985mAh @ 2a discharge

Charge: 24814mAh
Discharge: 15020mAh @ 2a discharge

Charge: 24787mAh
Discharge= 16759 @ 1a discharge

Charge: 24750mAh
Discharge = Yet to do

Lets take example 1 from the list above:
Charge
24897 x 5 = 124485mWh
There was a conversion from 5V input to 3.7 output, with an efficiency of 80%
124485 x 0.8 = 99588mWh
So 99588mWh or 26915mAh @ 3.7V should be the power bank capacity

Discharge using 2A load
16985 x 5 = 84925mWh
84925 is the capacity after efficiency loss (20%) from the circuit. So power output before conversion and loss will be:
84925 x 1.2 = 101910mWh
101910 or 27543 @3.7V

So the power bank's capacity in the above example is around 27000mAh. Just wanted to make sure that my calculations were ok.

Your Galaxy S3 battery capacity after three years

Hey Folks,
It's been more than three years since the phone was released. Many would have replaced the battery similar to stock or higher capacities.
Let's share the battery life and usage of our phones. I have attached snapshots of my phone from GSAM battery monitor app. I have installed a 4400mAh Anker extended battery.
Please share yours. Cheers. :good:

Attached Thumbnails

 


 

What is your rated battery capacity in Settings?

Settings > About device > scroll to the bottom

Mine 920F shows "DC 9 V; 1.67 A".

Is that standard?

Stock batteries only, please (so no battery cases etc.)