You wouldn't power your phone, laptop, or tablet with a one-use battery, would you? Chances are, though, that the cells powering your household electronics, flashlights, and remote controls are only good until the juice runs out. Save money on buying new packs of batteries by investing in a battery charger like this one available on Amazon. By recharging worn out batteries, you can save a bundle—and never run out of batteries again. Available on Amazon; $19.99.