Battery Power Failure

Joe Beador

New Member
The last two times I was out and about the neighborhood in my e-Joe Epic SE, all of a sudden I had no battery and therefore no power. Both times I came home and put the charger on it but it indicated a green light which coincides with the power bar on the bike before it failed.

I emailed Customer Service requesting advice before I start taking things apart as to whether or not it might be a loose connection on the battery.....but that was over a week ago and I have no received a response.

Have any of the forum members experienced the same thing and secondly, does anyone have any ideas/suggestions as to where I start to look other than taking it to the closest dealer which is 100 miles away.

Joe Beador


Well-Known Member
does anyone have any ideas/suggestions

1) loose electrical connection. Unfortunately the connection problem could be in the battery pack.
2) bad cell or cells in the battery pack.
3) bad BMS
4) bad controller.

In order of probability....... 1, 4, 2, 3

Intermittent power issues are often hard to find. Also, unfortunately, the only way to isolated a failed component is by replacing them, one at a time. Of course that will get expensive in a hurry if you have to purchase them.

Court J.

George S.

Well-Known Member
A cheap VOM, volt-ohm meter, might help.

When the motor quits, do all the lights go out? Most ebikes have a primitive battery meter, like 3 LED's. If they go out, the battery is probably not putting power into the electrical system.

The obvious stuff is re-seating the battery and checking for anything wrong with the battery to bike connection.

A bad cell could cause a voltage drop and sometimes that will trip the low voltage cutoff. With a volt meter you might be able to see the voltage of the battery, but you'd really want to know the voltage under load. Voltages will snap back once the load is removed. You can remove the battery and then replace it. If you apply full power again and the system shuts down, it might be a low voltage issue, a sag.

The problem with intermittent is that a repair facility never quite knows if the problem is fixed, or they may not be able to replicate the problem.

Things like a bad brake lever can shut down the motor, since they have cutoffs to kill the motor when you apply the brake.

The CS department seems to be showing a lack of enthusiasm for your problem. There are generic troubleshooting guides for ebikes, if you Google the topics.