A battery pack or a power bank is the simplest way to ensure your phone or laptop never runs out of juice. Picking the right power bank is a bit more complicated though. Depending on your needs, there are several options. Some offer the convenience of integrated cables, others will give you quick charging tech, and some can even power up laptops. Here are six of the best battery packs for different purposes. A Few Numbers Before We Start Not everyone needs a high capacity battery pack. Smartphones generally have about 3,500 mAh batteries, while tablets pack in around 11,000…
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