Hi,

I have a few old Ni-Mh battery cells. To find out what battery life
they got or how much capacity can they deliver, I thought of a plan.
I plan to discharge a cell and monitor the current and voltage.
Following is a link to preliminary schematic.

https://lh3.googleusercontent.com/-4-JELSPUpNw/UDrhx9598HI/AAAAAAAAEFU/UlhP=
WsAaQRU/s640/batt.png

Q1, power mosfet acts as a discharge switch and is controlled by a
micro (maybe a PIC)
The opamp acts as differential amp and feeds the ADC for current
Use another ADC channel for voltage measurement.

I would like to know if I missed anything.

Thanks,

Chetan Bhargava
http://microz.blogspot.com
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