ORIGINAL: obsbob
thanks , but I don't understand clearly. I have a volt meter only. I can't tell if 900 mah has been taken out of a 2200 mah battery.
A voltmeter will not do very much for you, especially for LiPo's.
RC Voltmeters for NiCD, NiMH use feature a load resistor circuit, so you can test the packs under load.
For LiPo's a typical load means nothing, as the voltage curve is VERY flat, unlike NiCD's and NiMH packs.
ORIGINAL: obsbob
Do you mean that the Lipos should be stored with 60%
charge and you can't tell by volts?
Correct.
You store them with 50-60% of their rated capacity, and the best way to do so is to watch what you are drawing from the pack or what you are putting into it.
Computer controlled chargers permit you to monitor this.