Carry an iPod-size rechargeable external battery to double or triple your phone’s talk time or your MP3 player’s playback time. They all have a USB jack; plug your device’s cord into that and you’re up and running again. The cheapest, smallest units provide a half-charge to a cellphone or MP3 player battery and take up little space in a purse or shoulder bag until needed; the largest provide 2-3 charges of a phone or music player. Recharge them by plugging into a laptop/PC’s USB jack, or into a USB wall transformer. Prices run $15-$50. The powerpack is good for 500 charges. One of the more sophisticated is the Energizer XP2000 Universal Rechargeable Power Pack, $30 street, with its own car and wall recharging transformers, four power tips, and carry case. There are many, many other choices.
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