How to Check Your E-Bike's Battery Percentage with a Multimeter

Sometimes the displays or batteries on e-bikes only show bars for the battery level. This is how to accurately check your electric bike's percentage of battery level.
The following link is for more information and battery percentage charts for different voltage batteries.
bikerreview.com/ebike-battery....
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[@jmcminn1076]

This is good stuff. I’ve noticed that the bike/battery reports full bars until about 55-60% remaining and then starts dropping down. So I’ll get
Like 25 miles before it drops a bar, and the. Like 6 more miles and it drops another bar, etc etc to end up with a range of about 50 miles (I ride the thing with heavy throttle so I don’t get 80-100 miles, but that’s fine, I actually don’t need 50, I just need to not be worried it’s gonna die on me after 30).
I do wish the display showed battery voltage or a percentage. Ah well.

[@TwoWheelWanderer650]

I wish mine did, too. I’m not sure why the display programmers don’t just make it display percentages. It’s obviously calculating them in some way.

[@randallhack4477]

Also worth noting with this is that while 48.1 volts may be 55% charged by way of voltage on a chart, as far as actual watt hours (range) left in the battery at that point (48.1 volts) you probably only have 25-35% range left and that is because the voltage starts to drop much faster in the lower voltage range of a battery So if you were to use voltage as a way of guaging how many miles you have left on a charge, you may find yourself peddaling the bike without assistance much sooner than anticipated!

[@TwoWheelWanderer650]

Very true. I’d be interested to see if there is some kind of algorithm that could pump out the “useful” measurement to break down the percentage of range remaining.

[@babygoat1963]

Would it be possible to mount a small voltmeter on the handle bars and splice it into the wires or battery somewhere so you could get an ongoing exact voltage level, rather than relying upon the bars on the display? It seems like that could give a person more of an accurate idea of remaining power?

[@TwoWheelWanderer650]

It might be possible if you splice into the wires leading from the battery to the controller or better, creating a connector between the two. I wouldn’t want to void the warranty.