Battery life very poor

[tritch]

marcb, I'm curious... did you ever get this resolved?

I recently purchased 2 handsets that hold the charge just fine, but 1 handset that does not.

On this 1 bad handset, I've tried the following:

1) flashed the firmware down to 26.40.0.15 back to 26.73.0.30
2) replaced batteries twice
3) completely discharged/recharged battery several times
4) tried different charging cradles

I've noticed the charging cycle algorithm is different between the good handsets that hold the charge and the one that does not after being fully charged:

2 good handsets: 2 minutes on / 2 ½ minutes off (holds charge)
1 bad handset: 2 minutes on / 5 seconds off (does not hold charge)

Nothing seems to fix this 1 handset, nor does anything change the charging cycle algorithm to the same as the good handsets.

Also noticed that the hardware versions of the good handsets are different from the bad one:

Good handsets: 26.0.0.10
Bad handset: 26.0.0.7

The batteries constantly feel warm on the bad handset even after it shows fully charged, so obviously the batteries are being overcharged.

I've come to the conclusion that either the charging circuit is bad on this 1 handset, or handsets with hardware version 26.0.0.7 have a defective charging design.