u/Delimadelima

This is a 24v 100Ah lithium ion battery (assuming authentic). In the zoomed circle, the black piece is the charging connector.

I would hire an electrician to connect 2 of this battery in series to achieve 48v 100Ah.

2 of these batteries even when connected in series will have 2 charging connectors.

My questions being :

1. How should I charge these batteries ?

2. Do I charge with a 48v charger or a 24v charger?

3. Do I charge both batteries individually or do I charge the "first" battery?

Thanks