Rechargeable battery packs

Extended battery packs like the PowerMat Dual 1850 Rechargeable Backup Battery get an honorable mention in this list. They work great if you find yourself needing a regular infusion of battery life day-to-day, but they're not my first choice in an emergency. If there's no power source nearby, there's no way to recharge them, and all you have is an expensive skipping stone.

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