I use the programable Grin Satiator to charge batteries from two different ebike manufacturers and which also have two different voltages and charge amps. You just need to buy adapters to suit each battery. It’s compact but not exactly lightweight nor exactly cheap. The main attraction of this charger is that you can program specific charge voltages, to say 80%, and charge amps, thus extending the life of your batteries. I bought mine directly from Grin with the specific adapters but below is a link from an Aussie supplier.
The Grin Satiator Smart Charger is the ultimate universal e-bike charger for fast charging. 12V-110V compatible. Get yours today at Electrified!
electrified.com.au