Re: 24v EV Global Mini eBike's

[Rransome]

I have 2-24v EV Global Mini eBike's that have old 24v ni-mh batteries. 24v Heinzemann geared hub motor.
I would like to replace the batteries with 24v Lith-Ion batteries. 
Will this work without any electrical modifications?
Will the charger for the ni-mh batteries work with the Lith-Ion batteries?
I want to achieve a high torque slow speed (6-8 mph) bike.

[Bikemad]

Hi andto the forum.

24V lithium Ion batteries can be used in place of 24V NiMH but you may need to change the connectors on the battery to suit your existing wiring connection.

Lithium batteries require a specific charger with a precisely set maximum voltage and therefore should not be used with a NiMH charger.

My 24V LiFePO₄ charger has a maximum set voltage of 29.2V, whereas my 24V NiMH charger has an unregulated output of 39.5V which could easily overcharge a lithium battery (if the battery's BMS didn't have sufficient overvoltage protection) and if left on charge for too long could even result in the battery bursting into flames.

Alan