Issue between battery and motor

[Vitor Tomas]

Hi


My golden motor Magic Pie 5 and my battery HL 48v 14.5a are getting a trouble.
I can't get power on my battery without plugin the charger. when I insert the cable of charger in battery I can see the app is running normally and the motor/ controller and the throttle seem too.


• In the battery itself (those lights that indicate power, if you press) also doesn't appear anymore.
• The 3 lights in the throttle are all OFF since the very early days of my installation.
• I only can see the app running in phone, only when the charger cable is plugged in the battery.
• When I pull the cable off the battery the app shutdown instantly .
• Could be the on/off switch of the battery that does not let the power arrive to motor controller ?

for other words , my bike does not move or get power to motor only when I connect the charger ..
I assume it's nothing to do with the motor/controller right and it's maybe problem with the battery?

thanks! cheers amigo

[Sam.Vanratt]

Hi Tomas
everything you describe points to the Battery. Depending on the internal chemistry this could be "normal" for a dead cell (=high to infinite resistance) after their lifespan is over.
Another possibility could be a broken connector in the battery itself OR the BMS is dead and blocks currentflow.
Do you have a voltmeter?
-IF you get any voltage (when not charging) put on a very light load and see if the  voltage is dropping dramatically
-I'd guess you do not get any "real" voltage.

Almost all loader electronic in combination with a stupid (=cheap) voltage-window BMS do treat a Li Cell quite bad. I build Li charger electronics for a living and do very careful construct good chargers, but that is for a different (price) class.
A BMS is very easy substituted with a different one (important is the fit for the cell chemistry) as most work the same way.
Contact your Battery supplier and ask for a revival/Warranty depending on your state of warranty.

Cheers
Sam