A500+ Battery

[Ohforf]

Yes, it's a rechargable NiCd Battery.
If you find a 3,6 V NiCd Battery of the same size and Shape,
it should be easy to replace (but it won't last forever)

The most popular Replacement is a Lithium Battery
but it needs a special Socket.
(you find the same on almost every modern PC Mainboard)
Note : These Lithium Batterys are not recharchable,
so you will need a Diode to prevent Charging
otherwise it may explode or leak.

Another solution worth trying :
did someone ever use a Gold-Cap ?
should be a nice experiment

[Ohforf]

InTheSand wrote:
Has anyone ever tried 3xAA or 3xAAA rechargeables? These usually seem to be 1.2v each...

 - Ali

I tried that on an old PC Mainboard.
Of course, it works, but :
- You need a Battery Box, NiCd Batterys don't like soldering
- most NiCd's are Hi-Current Types, they Discharge    themselves a bit more over Time