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Joined: Aug 2007
Yes, they should work just fine. I have found the 1/3AAA cells to be a bit too small for a good fit without a lot of shimming, etc. That's why I liked the 150mAH cells. They were only a little shorter, but their diameter was a good fit.
The HP battery pack dumps a pretty good slug of current into the batteries on charge (around 15mA). This amounts to a C/5 charge rate for the original NiCd cells, C/7 for the 100mA NiMH cells, C/10 for the 150mAH cells. I prefer not to leave NiMH cells on a constant charge of over C/15-C/20. The 15mA trickle charge rate does not seem to heat the cells up, so it is probably OK. To assure maximum battery life, you may not want to charge them for more than 10 hours or so. Also stop charging if they begin to get overly warm.