Does it work on dented or square cans?

Not reliably. It grips the rim and drives itself around, so dents, square cans and very large cans can make it slip or stop.

Does it need batteries?

Yes, it runs on batteries. Fresh cells matter; weak ones make it slow or stall mid-cut.

No. It cuts from the side, so the lid and can rim come out smooth, and the lid can be set back on to cover the can.

It is faster and needs no hand strength, but a manual opener never runs out of power and handles odd cans better.

It handles most standard round cans, but very large or heavy cans are where owners report the most trouble.

The opener itself. Batteries are not included, so plan to have them on hand.

At Newegg, for $32.99, as of our latest check.

$32.99at NeweggChecked Nov 8

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