Can only gain get good stats by filling your field with other copies of himself.
If you somehow manage to fill your field with 3 copies of Batteryman AA you will have three 3000 attack monsters on the field which is enough to OTK most opponents.
Take note that the boosts only work if all your Batteryman AAs are in the same battle position. If at least one of their battle positions are changed, they all revert to 0 attack 0 defense monsters.
Batteryman are an archetype of Thunder-type monsters with weak stats and are more focused on controlling the field with their powerful effects. They gain advantage through special summoning each other and destroying the opponent’s field with Batteryman Industrial Strength. You can tribute Batteryman monsters to summon Super-Electromagnetic Voltech Dragon with various effects.
Use these cards to make your Batteryman deck more effective at gaining advantage. Batteryman Micro-cell can special summon a Batteryman from your deck and then draw you a card when he is flipped face-up. Batteryman Charger special summons a Batteryman from your deck when he is normal summoned and gains attack for each Batteryman you control. Recycling Batteries adds 2 Batterymans from your graveyard to hand. Battery Recharge revives a Batteryman at the cost of 500 LP. You can discard Thunder Seahorse to search 2 copies of a Thunder-type monster from your deck.