Gear Review: Callpod Fueltank DUO Rechargeable Battery Pack

A rechargeable, lithium-ion battery pack for all your gadgets.

When there’s no sun for your solar panel, or you want a fast fill-up for your electronics, plug into the Callpod Fueltank DUO. This rechargeable, lithium-ion battery pack is the fastest, lightest, and most powerful portable charger we’ve tested. We consistently saw three to five full recharges on iPhones and cameras—in about 90 minutes. There’s nothing to break, no cold-weather worries, and the 7.5-ounce unit fits in a shirt pocket. Also comes in a smaller UNO version with half the juice ($50). $70; 7.5 oz.;

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