Battery indicator goes down while the engine is working hard

[Myonk]

While riding my generic eyu.co euc I have noticed that the battery indicator will go down while riding, just to go back up again when getting off. After figuring this out I tested it by riding up a steep hill. The indicator went to one light out of four. When dismounting or slowing down on a flat surface the indicator goes back to what the battery is really at. Is this normal? Will causing the indicator to go to zero while working the engine cause a BMS failure? Any help from someone experienced with these generics would help

[John Eucist]

5 minutes ago, Myonk said:

While riding my generic eyu.co euc I have noticed that the battery indicator will go down while riding, just to go back up again when getting off. After figuring this out I tested it by riding up a steep hill. The indicator went to one light out of four. When dismounting or slowing down on a flat surface the indicator goes back to what the battery is really at. Is this normal? Will causing the indicator to go to zero while working the engine cause a BMS failure? Any help from someone experienced with these generics would help

Your battery indicator is basically just a voltmeter.  When under load the voltage drops causing your battery indicator to show less charge.  It is normal.  If voltage drops too much of course you will lose torque or potentially have the motor cut off entirely.  This is also "normal" unfortunately.

This is another reason why it's good to have more cell packs wired in parallel to reduce the voltage drop effect.  For example, a 680 Wh capacity euc has four packs of 16 18650 cells wired in parallel.

[Myonk]

@John Eucist I guess it makes sense that it's just a voltmeter. I'll be careful to make sure it doesn't drop too far and I did kinda expect this as this thing is so cheap. Is this behavior normal in higher end brands such as nb1 or kingsoft?

[John Eucist]

I've edited my last post with some more information that addresses what you're asking.  Refresh to see.  

Your generic probably has one pack and nothing wired in parallel hence the voltage drops are more substantial.