The battery is a 2S Lipo (with 2 x 3.7=7.4 volts). Any 2S lipo charger will fit, i.e. one that has a connection for 2S (2 wires on the charging cable from the battery, i.e. 7.4V). Can be an expensive one with more charging ports; or a (cheaper) one with only a 2S port. I bought one of these a few months ago on Ricardo. Have fun & greetings to the Minipigs...!

I have the Voltcraft charger from Conrad, very good.

Hello
I would take one that also monitors the batteries. I have an expensive one from Orion. But you could order the Robitronic Expert LD 80 for 45.- from Galaxus. I would advise you not to use the original USB charger.