Thanks everyone much appreciated.
When I charge the bike, I didn't check the voltage, but the bike shows 100% for the battery. When I use the charger, I always wait for the charger to shut off indead, so is my girlfriend and her batteries have been used more than mine and are still perfect. The bike shows 100% for the battery, but then when it goes to let's say, 80%, it shut offs by itself ...I'm left wondering about your charger and how you're using it. When you turn the bike on after charging, what are you seeing for voltage? Are you waiting for the charger to shut off at the end of it's charge?
Ok, thanks ! And, once I see the voltage, if one of them is way under or different then I know that the battery is dead?To troubleshoot, need to know the battery voltage, not in percent. Not sure your display is able to do that, but if not, you'll need to use a voltmeter. You're looking for a voltage just over 54 volts. Like 54.4 or maybe 54.6 when fully charged. Check all of your batteries for this bike to see if they are the same.
Nice, thanks for the tip I'll try to figure it outAnything is possible, but I'm really hesitant to tell you one of you batteries is dead. They generally go way longer than that unless they've been badly abused - not very likely. Way more likely something stupid is wrong. Just need to figure out what's going on....