I have an older TT 100 LR @ 1994
It will not take a charge curious if anyone has had replacement batteries installed from either a batteries plus or Interstate batteries store
Tritronics web pages states that 100LR needs to be sent back to factory. Collar Clinic will refurb for @$109 and no idea what actual batteries cost.
May be smarter to send to Collar Clinic but just curious as to cost and satisfaction if replacing batteries local