they didn't freeze, they were sitting in his house.
when he first put then back in the scooter they had no power to even light up the instrument display
i put my meter on them and he's getting 50 volts.
i don't think the cells are damaged
just really discharged.
but i don't know anything about sealed battery's.
the scooter came with a smart charger .
i told him to leave it on for a couple of day to see if they can come back.