Ideally contact the mfr of the forklift with model number of forklift AND battery. otherwise contact battery mfr with battery information. I know the charger I have requires a dedicated 240V, 30A circuit and it took all night to recharge the batteries, $$$$$ ! Had a 'powerpole' connector system, easy to use and safe.
You can also use Google 'battery model, charger' and see what hits come up.
Try a local forklift sell/repair shop....
Jay