Voltage never lies, battery percentage is always a guess based on some algorithm…
If you’re coming from a commercial board and are wondering how to figure out how much battery you have left then this is the page for you!
Battery Voltage
As a battery depletes its voltage decreases…
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Voltage inaccuracies on PC/Mobile
The reported voltage is based on the measurement on the controller itself. Any VESC compatible controller can measures the input voltage. This measurement is not ultra precise compared to what you’d see on a voltmeter, it some cases it can be off by as much as 1-2 Volts! This has no impact on your board’s performance, but you should take it into account when setting your voltage cutoffs and tiltback thresholds.
In 3rd party apps you may be able to adjust it (e.g. FloatControl lets you specify a voltage correction value)
How is Battery Percentage calculated?
Different methods exist…
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Battery Percentage in VESC Tool
The VESC tool currently calculates battery percentage based on battery voltage, but if you have a VESC compliant CAN BMS…