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How to measure battery capacity of various chemistry?

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drummerdimitri:
I have a few old Li-ion and lead acid batteries that I would like to test for actual capacity however I am not sure at what current draw their rated capacities where deduced. I have the measuring equipment that gives me a mAh/Ah reading.

If i am correct, Large lead acid batteries' capacity are based on a 20 hour constant current draw. I have the measuring equipment needed just not sure how to set the load.

Also, to what voltage should they be discharged? I am only interested in knowing the actual capacity today to know how they stand up and if they need replacing.

drummerdimitri:
BUMP!

KC0PPH:
Li-Ion batteries should be discharged at 1C for measuring capacity. I dont remember off of the top of my head what the Low Voltage Cutoff is as I only take mine down to around 3.7V per cell.

Hiemal:
Low voltage cutoff for li-ions is usually around 3.0 volts i think.

Rerouter:
If you want to compare to the rated capacity, then you measure at the load they specify for the rating

If you want to know the capacity for your specific use case, then you measure it at that load.

Lead acids you stop discharging at about 10.5V, li-ion you stop at about 3.2V

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