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I bought an e-scooter online and the seller pretty much disappeared after the sale. I can live with one of the headlights not working but I find that the battery indicator isn't working either. I found out just earlier that it's not a small issue since I had to carry the scooter home instead of the other way around when it ran out of power without any prior indication. It would also be very dangerous if it happened during a risky situation.

I tried to searching google on how to fix it but came up with nothing since I'm an utter beginner. I would really appreciate it if anyone can direct me in the right direction of knowing how to maintain and repair e-scooters. Thank you.

  • I'm not sure electric scooters are on topic here, but if they are you're going to need to edit and add the make and model if you're going to get any answers. You also need to describe the meter more, is it a digital meter or a mechanical one? – GdD Sep 19 at 12:47
  • You’ll want to get an cheap DMM and rig it up to monitor battery voltage until it’s fixed <10$ – Tony Stewart Sunnyskyguy EE75 Sep 19 at 14:54
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If the scooter is equipped with batteries of a lithium chemistry rather than lead acid, the only reliable method to monitor state of charge is to charge it to a known capacity (in Ah or mAh) and use a device to record/display power used (in Ah or mAh). When you reach 80 percent used, charge immediately if you want your batteries to last any appreciable time.

Lead acid batteries can be monitored by voltage. A 12V battery should never be depleted below 10.5V and even doing so will reduce the lifespan of the battery. You can use the same time of meter/monitor for lead acid as for lithium chemistries, but don't deplete below fifty percent if you want a happy, long living battery.

In the hobby world, there are Watts-up meters. In the E-bike world, the CycleAnalyst is the top item. There are certainly going to be other devices that will work.

For all of the above, you'll have to open the case (voiding any warranty, as if that matters) to attach to the battery terminals and you'll have to be creative to provide a mount where you can see it while underway.

A typical installation involves a shunt, a conductive bar that connects to the battery terminal. The removed cable is then attached to the other side of the shunt. They are usually marked plus and minus to ensure that your energy use is not a negative value, but even that is trivial. There will be a sensing lead from the shunt to the display. Depending on the device you purchase, the meter will operate from the pack voltage (CycleAnalyst, for example) or you'll have to provide a separate source for the meter. Read the specifications carefully.

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