Last week my Bosch powered ebike was stolen after I had removed the battery. Now I have the original 500 power pack battery, my extra 400 power pack battery and a 4 amp charger, and I don’t know what to do with them. I tried buying a bike the uses power back batteries, but I ended up with one that uses a power tube battery. Any ideas on repurposing those batteries and charger. The batteries and charger are only 3 years old. Ed