Me and my employee could not agree on something. He said that for
forklift batteries, the charger has to exactly match the battery and
be special made to fit the battery.

I said, no, any proper voltage source with a timer, capable of proper
current to put the amps, should be enough.

We could not agree and I decided to ask here. Who is right?

Specifically, we bought a walkie stacker, older but fnuctionally
similar to this one: http://goo.gl/Lrrsz

We bought it for resale. It powers up and down, as well as forward and
back.

The stacker comes with a weakened battery, and without a battery
charger. The previous owner charger it with a "car charger". I am
wondering, what should one get to charge this one. It has a 12v
Deka battery that weights, perhaps, 300 lbs.

i