Michael J. Mahon wrote:
It's not a rechargeable battery--in fact it may explode if you try it! Mike is right--replace it with an equivalent lithium cell. -michael
I'm actually amazed that 22 years later, the battery in my ROM 01 IIgs still holds the time and date! I got a ROM 3 style battery holder (can be found in just about any Mac) waiting to be installed the day it finally dies.