So one of the employees forgot to turn off the forklift (Hyster W30ZA2 Pallet Stacker) and left the key in the on position over the weekend.
When I came in and noticed the battery was dead, I turned the key to the off position and plugged it into the extension cord after doing the usual cable switch.
After about 10 minutes of charging noise, 3 lights come on.
1 SOLID Wet & AGM Light (Yellow)
Flashing 30 and 90 % charge indicators.

Any idea what it means? If they are dead batteries, how can I access the battery compartment? Do you need any equipment to get the batteries out?

I'd like to get the batteries out so I can charge them individually to see if there is a bad one. I suppose it could be other things also, maybe someone can help me or lead me in a direction.

Thank you!