I have two GM Merge eBikes and they both work great. My understanding is the batteries are about 46 volts. I take the batteries out of mine often to stop the bike from draining them. I have an acquaintance with a Merge and the first time the battery came out was two days ago when I went to look at his issue. His bike is 2.5 years old will not charge. I tried his charger on my battery and it worked fine. I tried both my charger and his on his battery, but only got a brief blip of charging before the charger went to standby mode again. When his battery is in the bike, it will turn on and set fault codes for low charge. But in or out of the bike it will no longer charge. With my battery in his bike, it operates fine. Since his battery is not a brick yet, is there a way to jump some voltage into it and get it awake to charge?