There’s a fine line between enthusiasm and obsession.

This Rayovac Overnight 4-Position Battery Charger just loves to charge batteries. Loves it so much, in fact, that it won’t stop until you tell it to. That’s right: it’ll crank juice into two or four of these NiMH batteries at a time, and it’ll keep on cranking pretty much indefinitely unless you stop it after the recommended 10-17 hours of charge time.

Over time, an overcharged battery can lose voltage, shortening its life and requiring further battery purchases. While we’d love to sell you another dozen of these NiMH babies in a few years, we offer this information as a public service. The More You Know and all that.

If you can remember to remove the batteries before that point, you’ll enjoy years of rechargeable battery power. Enough to fuel a robot, even. But if you’re the kind of snooze-button addict who’d be late for your own funeral, buyer beware.

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