newegg.com offers the Energizer XP4000 Portable Universal Rechargeable Power Pack for $24.99. With free shipping, that’s the lowest total price we could find by $15. This battery pack can be charged up to 500 times and features an auto shut-off function upon obtaining a full charge. It comes with numerous adapters to power a variety of electronics, including digital cameras, iPods, cell phones, and more.
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