[ICOM] Replacement batteries for IC-2AT

[Steve]

I've got an IC-2AT with a IC-BP3 battery pack and BC-25U wall wart. The 
BP3 has seven 270mAH cells that are shot.

A couple of questions about which I'd appreciate thoughts and advice.

Can I install NiMH batteries in the BP3 instead of nicads?

Should I install NiMH batteries in the BP3 instead of nicads?

If I do use NiMH's, can I charge them the same way I've been charging 
the nicads? Any cautions or concerns about overcharging? Or, for that 
matter, undercharging?

Can I buy the seven cells of whichever type soldered and taped together 
with pigtails for connecting into the BP3? From where?

Thanks.

Steve
K8JQ