Ultralast AAA NiMH self-discharge test...

[Buck91]

Well, I'm currently in the process of testing a pair of Ultralast AAA NiMH cells for their self-discharge rate. I'm no expert, just taking voltages everyday on my DMM and recording in excel. Its only been a few days, but heres the results so far.

Battery 1 voltageBattery 2 voltage
Fresh charge
1.38 1.37 1:55am 22 Nov 2007
1.36 1.35 11:02am 22 Nov 2007
1.34 1.34 7:41pm 23 Nov 2007
1.34 1.34 7:40pm 24 Nov 2007
1.34 1.34 10:36am 25 Nov 2007
1.34 1.33 5:05pm 26 Nov 2007
1.33 1.33 3:49pm 27 Nov 2007

I'll upload the worksheet when the cells reach 1.20V and again at 1.0V

 

[koala]

While your at it, is also good to record the ambient temperature. When your done, you can put them together in a graph so we can get a better picture. Goodluck.

 

[Buck91]

Well they just sit out on my desk 24/7 in a thermostat controlled house. I think its set around 68*F, but my room is typically a little cooler... No thermo worth using around here anyhow.

I did forget to mention these were NIB before I charged them up on a Delta V type charger.