I have a 36 V lawn mower with a battery container with three 12 V SLA batteries in series.
I am thinking about switching to LiIon batteries for more run time (and hopefully more recharge cycles). I can find batteries that fit physically, and putting them in series is easy.
I don't think the SLA charger will charge LiIon batteries correctly. I found 36 V LiIon charges online. But...it is safe?
- I thought LiIon batteries packs need a thermal sensor input to the charger to prevent overheat/damage during charging. All the LiIon charges I found are 2 pin output.
- Is it safe to charge 3 LiIon in series? Or do I need to charge each 12 V individually?
I found someone doing exactly this project but using small cells (YouTube). However, he does not discuss if/how he changes charging circuit or running circuit.