Originally Posted by
spinnanz
Batteries are paired to particular brand bikes but not particular bikes. The problem is they seem to change the form factor of the batteries every few years so it's often hard to get a new one that will physically fit the bike, let alone worry about the pairing side of things.
before most batteries were external but now everyone and their dog is going internal. I had a choice with bulls and chose external since I had to take the battery out so much. glad I did since I can use the same battery on our tandem.