I purchased one (pre-sale) and had an issue with it properly locking into the frame. After examining the original battery that came with my Rad Rover 6+ I found the metal piece between the two batteries did not match. The bend in the metal on the new battery was a little off causing it to not be flush with the plastic. The bike did start just fine but I was hesitant to ride the bike without the battery properly locking.  I did contact Rad but while awaiting a reply I decided to see if I could fix the issue.  I do not have the tools to fix the metal piece to match the original battery but found if I loosen the screw holding the metal piece the battery would lock in place.  Before I resolved the issue with the metal piece, I did test the battery in the bike and had no issues.  I feel very confident about this battery and decided to purchase another as well.  Will be carrying two extra batteries on my rides.