36V 11ah cells to a 24V 10ah battery, possible?

[hugoli]

Hello,

I have a ebike with a 24v 10ah battery but cells are dying. Same battery is not for sell anymore.

I have the possibility of buying a 36v 11,6ah battery. Box is exactly the same with only 1 difference, the power connector in the box that connect to the controler is just 1cm to the left and that is why I cant use this box.

So my idea is: opening the new battery box, change the cells to the 24v old box.

Box size and design is exaclty the same.

Charger is different. 36V battery have a more highr V charger.

My question is, it will work?

Wont damage the 250W motor?

And, the 24V charger, will charge the 36V 11ah cells inside the 24V box?


THank you

 

[hugoli]

Anyone can help?

 

[amberwolf]

So my idea is: opening the new battery box, change the cells to the 24v old box.
Box size and design is exaclty the same.
My question is, it will work?

Depends on the internals of the boxes. If they are exactly the same *inside* (not just outside), then assuming everything isn't glued down so it breaks when you take it apart, then yes you can transplant the cells and BMS and wiring from one into the other.

If they are not exactly the same inside, then you'd have to see whether the differences will prevent it--you won't know till you have them both apart in front of you.

Wont damage the 250W motor?

The motor? Probably not, but it depends.

The bigger issue is that you'd need a controller designed for 36v instead of 24v. It's possible, even probable, that your 24v controller has overvoltage protection to keep it from operating at higher voltages.

If it doesn't, it may work, but depends on the parts in it (capacitors, FETs, low-voltage-power-supply, etc). It might work for a little while and then fail.

The motor will get hotter and go faster by the amount of the ratio between your old voltage and the new one. So if you keep the throttle lower than you used to, so it doesn't go any faster, then it also wont' get much hotter and will go the same speed you used to.

If you don't have a throttle and it's an on/off controller (just outputs whatever power level you set in the display whenever you pedal), then it'll always go faster than it used to and it'll get hotter too. *that* could damage the motor, eventually, depending on usage conditions.

And, the 24V charger, will charge the 36V 11ah cells inside the 24V box?

No.

You will have to buy the 36v charger with the 36v battery.