Question about charger supply voltage

[Roncos]

Hi All

I have the following equipment for my ebike build:

13s2p battery pack using Panasonic 3400mah 18650
BMS similar to this one: https://www.ebay.co.uk/itm/13S-48V-20A-Li-ion-Lithium-Cell-18650-Battery-Protection-BMS-PCB-Board-Balance-N/222925729888?epid=507305140&hash=item33e768b060:g:ib8AAOSwinBal7kf
Supply transformer/rectifier similar to this one: https://www.ebay.co.uk/itm/Electric-Bike-Scooter-Lead-Acid-Battery-Charger-Power-Adapter-US-Plug-60V-20AH/252803271259?hash=item3adc3fca5b:g:J60AAOSw32lYv82x

The battery will be 54v or so when fully charged. The power supply was advertised as 60v but is actually 69v at no load. My question is, is this voltage acceptable? Will the BMS still be able to safely regulate the current/voltage across the battery pack?

Thanks

R

 

[docw009]

The 60V voltage in your proposed charger (for a lead acid application) is too high for a 13S lithium battery. A lithium battery charger would be limited to 54.6V for 13S. This gives additional redundancy if the BMS fails to hold the pack voltage. By using the wrong charger, you take on un-needed risk.

I have no idea about the quality of this product, but this is the category of charger that you should use.
https://www.ebay.co.uk/itm/48v-Lithium-Battery-Charger-2amp-Electric-Bicycle-Cycle-Bike-10amp-15amp-Ah/192391026783?epid=1160905472&hash=item2ccb66185f:g:2AwAAOSwCtJaVKIo

As for the BMS, how do you know it's really a balancing BMS? When I was looking on ebay myself for a 13S BMS, I didn't trust the listing to be a balance BMS unless the specification listed the balance current. Eventually, I bought one from a vendor that listed the balance current and he also drew a circle around the balance circuits in his picture.