Hi , The heart of any ebike , escooter, electric car , wall packs is battery packs. Replacing the battety packs in those systems is very expensive. Most of ebike shops either won't tell you or they don't know that the battery packs can be repaired for less than half the cost of the new batteries. I have been helping a lots of ebikers for more than 5 years by fixing their batteries. Most of them stop working after 1.5 to 2 years of purchase and there is still a lot of life left on them. I hate to see them to go to the waste and the bike owners would have to buy expensive replacement packs. I have more than 90% success rate of fixing them. Please contact me if you want to save money on expensive ebike batteries. I also fix other electrical parts on the ebikes, escooters and ecars like controllers, motors, throttles etc. Please text / call - 7787007100 Thank you for taking time to read my ad. Dan.