So I thought I’d upgrade the ezip 400 scooter from lead to lithium batteries. Original were two 12V SLA batteries. I got two LiFePo4 that have same Ah rating but the scooter cuts off after few seconds as load increases. Do these lifepo batteries have some kind of internal shutoff circuit and cuts off power when current draw is too much? But they’re rated the same as the SLAs. I’m new to lifepos so have no clue, any help will be appreciated.
Yes, they do. Do you have the rating info?
What specifically? There is some information the picture of the battery on the battery.
Here’s a link to the lifepos sale page:
It doesn’t list peak discharge that I can see, but current is listed as 8-10amps.
Not much current to work with.
LiFePo4 are generally low output unless specifically for use in EV.
So I would say, they are not rated same as SLA battery.
1 Like
Yeah I figured the lifepos couldn’t match the discharge rate of the SLAs. Thanks for your help!
1 Like
"The LiFePO4 batteries you’re using most likely have a built-in BMS (battery management system) that shuts down when the current draw is higher than the pack allows. Even though the Ah rating matches the old SLA batteries, the way LiFePO4 works is different, and the BMS limits the peak current to protect the cells. The scooter motor pulls a surge of amps when starting, which can be more than the BMS limit, so the pack cuts out after a few seconds. Lead-acid batteries can handle short surges better even with the same Ah rating. For your scooter, you’ll need LiFePO4 packs with higher continuous and peak discharge ratings, or ones made specifically for scooters and e-bikes.