Ed Huntress fired this volley in
:

Why are these huge prime-mover batteries 12 V? I'd think they would
use much higher voltage battery packs, like electric cars, and for the
same reasons.

Walkie-stackers aren't "huge", and neither are the batteries. They're
about the same size as a semi-tractor's batteries.

The bigger forklift batteries are typically 36V or 48V.

LLoyd