[MrScooter93]

Hello! I have an Electric scooter (goped) and have some questions about the batteries. The system is 60v (Lead Acid) and at ~66 volts the charge gauge shows 100% (though it drops to 64v/~90% pretty fast) and under normal load on a flat surface it'll drop down to 60% and when it reads 0% (50v) under load it'll read 35-40%(~58v) with no load. At no load 35% it barely has the power to move.

So my questions are, should I calibrate the charge gauge to say 100% under load when charged or should I just leave it and be happy with the 60-0% I can use? And I also noticed that it dropped to 47 volts when I climbed a hill! Thats less than 10v per cell, will that cause any damage to my pack? What happens when the load drops the voltage to far? ( i have five 12v in series)

 

[piotrsko]

That would be pretty typical for FLA. 10 v under moderate load won't kill them, 10v sitting no load means you went too far on discharge and they are sulphating to death. At what you call 40% they are mostly discharged to empty or beyond empty.

 

[MrScooter93]

Alright cool! I guess the charge meter doesn't count in peukerts effect that's why it says ~35% when depleted under no load. With ~11.3v per cell left it won't move above 7mph and fully charged it'll do 35mph so I guess I can drive until speed start to plummet without worrying about those precious Lead plates lol