can I use a 55v charger for a 48v battery

radiorental

100 mW
Joined
Mar 29, 2014
Messages
39
Location
stow, ma
I have a couple of Lithium Ion chargers from previous projects, one is 55V and the other reads 59V. My current working battery is 48V and I've misplaced the charger.

Will the BMS regulate over voltage into the cells? Can I use these chargers?

thanks!
 
999zip999 said:
You have moe info on the battery ? What voltage is it now.
Good question, it reads 48v and the bike computer says it's half charged. I've had it for around 4 years and this is the current product page
for the type of battery I bought
https://www.leafbike.com/products/lithium-battery/48v-li-battery/48v-15ah-rack-lithium-ion-battery-1000.html

I dug into the site a little and it says the charger for the 48v battery has a rated output of 55v. So I guess the 55v charger from a previous project will do until I find the unit that came with the battery.

This is what they sell for 48v batteries. Although the charger I got from them has a metal housing etc.
https://www.leafbike.com/products/electric-bike-parts/charger/lbp-48lbc-853.html
 
Battery voltages are "nominal" and don't accurately represent the actual battery voltage.

A 13 series Li-ion is typically called a "48v" battery and charges to 54.6v
A 14 series Li-ion is typically called a "52v" battery and charges to 58.8v

The charger needs to match the cell count. Don't depend on the BMS to limit the charge. The BMS should only protect against a fault.
 
999zip999 said:
Let's see a pic of the Chargers maybe you take the cover off and turn one down a bit.

Thanks, there's no tunable pots inside the chargers I have. They seem to be of a fixed design.
 
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