I have a good charger, That batteries have both exploded (like a gunshot) on discharge. I have also observed that it seems to happen in a certain way. First the batteries are usually about 3 or 4 months old and have had almost full discharge each time. I bike 1000 kms a month and that is about 50 kms (2 charges) a day. After several months like that the batteries don't appear to have the same 'umph' they first did and seem to really be mostly discharged after about half the trip. Somewhere near the end of the trip one of the cells explodes.

Is there a place near Toronto that can rebuild these things? I'm riding about on my trusty SLA right now. Boy, are they heavy!