In article om,
"Robert M. Gary" wrote:

If it is a detachable battery pack, there are several suppliers that can
swap the old pack for a new. I replaced a NiCd pack for a NiMH on an
ICOM.

Where did you go? I'd love to try that.

I cannot remember which one. I checked prices at AirVenture and bought
the one with the best price. Look in any of the aviation mags, they
usually have ads. If you cannot find any there, I will look for my
business cards.