Pick the right battery for the job

Expert tests show that each type of battery -- including cheap alkalines, pricey lithium batteries and eco-friendly rechargeables -- has its strengths and weaknesses. Pick the right battery type for the job, and you can save yourself money, time and the frustration of constantly having to change batteries.

  • Hybrid rechargeable batteries are best for most uses. These batteries can save you hundreds of dollars in the long run, and they're better for the environment than disposable batteries. The best brands come pre-charged and hold their charge for years, so they're just as convenient as disposables. The top-rated Sanyo Eneloop Rechargeable (*Est. $12 for four AA) is a hybrid battery. Experts say this is the most cost-effective type of battery for power-hungry devices such as children's toys, Wii game controllers, and digital cameras and flashes.
  • Lithium batteries pack the most power. Disposable lithium batteries outlast all other types in digital-camera tests, but they're also expensive and less environmentally friendly than rechargeables. They're best used when recharging isn't an option, such as when traveling.
  • Alkaline batteries are a cost-friendly choice for low-powered devices such as smoke alarms, wall clocks and TV remotes. Experts say costly lithium and rechargeable batteries are overkill here.
  • Make sure battery chargers are "smart." These shut themselves off when the battery is fully charged. USB chargers may not shut off, but at least signal with a light when charging is complete. This will help you avoid wasting electricity and overcharging -- and possibly damaging -- your batteries.
  • Don't mix partly used and new batteries in the same device. The new batteries treat the old ones as part of the load and will try to recharge them, causing them to heat up and leak.
  • Store batteries in a cool, dry place. In storage, alkaline batteries are good for about seven years. Lithium disposables are good for 10 to 15 years. Hybrid rechargeable batteries keep most of their charge for a year or more (three years for the Sanyo Eneloop). High temperatures, low temperatures and humidity can shorten a battery's life.
  • Charge extra hybrid batteries or keep a few disposables on hand, in case your rechargeable batteries run out at an inconvenient time.
  • Don't carry loose batteries in your purse or pocket. If a battery inadvertently comes into contact with a metal object such as coins or keys, the battery may charge, leak or, in rare incidences, even rupture.

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