Remote Control Helicopters (Low Leighton SK22)

2 Remote Control Helicopters - Syma S107G models.
Both controllers work. Both helicopters charge...but don't seem to be able to lift off the ground.
They've been sat unused for a few years so am wondering if batteries in helicopters are no good any more?
Just wondered if they're any use to anyone who knows what they're doing with this type of thing.
Comes with 2x helicopters; 2x controllers; 2x charging cables; 2x instructions manuals; 1x box; 1x pack of spare parts.

Collection from New Mills