you NEED the Operator's manual to be available to any operator that is an employee, to be in compliance with OSHA regulations.
a battery charge cycle is;
8 hours charging, 8 hours cooling off, Check battery electrolyte (water and acid) volume and about 5.5 hours of operation in an 8 hour work day. be sure to only add water AFTER the charge, and unlike a car battery where you fill it to the ring, if you can see -any- water in the cells, it does not need any added.
never leave any battery plugged into it's charger more time than the weekend hours.
As you may have noticed, this battery is a bit deeper and holds more electrolyte than an automotive battery, and as such, it -needs- ONLY long charges and it kills the battery to "short" or 'opportunity' charge, to be sure that the solid material in the electrolyte that gets 'knocked off" the plates has a chance to mix with the water, and not fall to the bottom of the battery and turn into a solid, which will eventually push up on the longer (positive) plates. The "equalize" charge is supposed to be every 5 charges (the weekend) to help with this mixing.
Forklifts don't really get a "model year", but I am sure someone will be able to look it up.