Cell phone battery useful capacity testing

kosPap

Flashlight Enthusiast
Joined
Mar 1, 2007
Messages
2,896
Location
Naoussa Greece
hi all!

I was called to find a replacement battery for a family member's phone, and in the process I thought of measuring the useful capacity of the cells, cos it turned out there are 3 phones with the same battery +1 spare around the family.

I am pretty confident i have the processes alright cos i am already doing it with Li-Ion batteries

Asumming proper pinout, I intend:

1- hook a LED and a one chip 7135 driver on the battery and measure time. 350mA is 1/3 of the rated capacity and I am not shooting for precision

2- test internal resistance with a power resistor.
i will be starting low and maintain drain at 0.5C


Am I wrong in my plan?
 
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