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The Ocoopa UT4102 will warm your hands on cold autumn or winter days. With a capacious battery with a total capacity of 10,000 mAh (2x5000 mAh), the device can last up to 14 h on a single charge. An additional advantage is the powerbank function, which allows you to charge your smartphone more than 3.5 times, making it ideal not only for winter walks, but also when traveling, hiking or camping.