I have a charger that I use for my 24 volt forklift and I also have a 48 volt forklift and I don't have a working charger for it. Is it possible to somehow use the 24 volt charger to charge the 48 volt battery bank? Someone suggested that it would work without making any changes but I tried and after several hours the charger said the charge was compete but the forklift still said the battery was dead. I don't think the batteries would have gone completely dead, they were just working recently, but I'm aware that the fact that they were totally discharged may have killed them. But they aren't showing any sign of a charge and I'm hoping to give it another try. Is there any possibility of reconfiguring the bank into two 24 volt banks temporarily to be charged with the 24 volt charger? Was my friend correct in saying that the 24 volt charger should have charged the 48 volt battery bank with no changes? I suspected that he wasn't but I'm not sure.
You could charge first the half bank and then the other half bank. No problem at all.
Since the solution is trivial and it didn't came immediately to you, I have a reason to think that you don't know too much about electrical engineering. Well the forklift battery can be lethal in case of short circuit, so I would suggest you to find somebody that has at least some knowledge.