There really is nothing special about coin batteries as a retrofit into Amigas. The original was a rechargable Nicad. Provided you match the voltage (and the polarity, of course), the capacity (usually measured in mA/hours) can be just about anything. I use cordless phone batteries fron Radio Shack. I splice on longer leads so they can be tie-wrapped far away from the motherboard (and easier to inspect and replace 
). If they do leak in the future, the board won't be damaged.
Relocated the battery on my A2000 years ago. Can use anything.
