Thread: New Product ESR / IR Meter fo Lipos
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Old Nov 06, 2010, 06:58 AM
Wayne Giles is offline
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Rugby, UK
Joined Feb 2007
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Originally Posted by mtnflyer44 View Post
Wayne, received my meter Thursday. Appreciate your prompt shipping
Thanks, Marvin.
If you have any results from various lipos you feel happy to post it would be most interesting.
Provided they are taken at the same temperatures they are comparable.
The are several reasons that your results from chargers are so unreliable.
(a) Many don't use Kelvin connections, so connectors are included which used to be insignificant but not now with such low cell IRs.
(b) They are measuring charging IR at low currents not discharging IR at high currents.
(c) Charging itself is endothermic so the cell cools and IR rises. At low currents the I2R heating is insignificant but as this is a square law and the cooling is, I believe, linear with current, the I2R becomes dominant at higher charging currents. This heats the cells and drops the IR reading.

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