Power supply

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    by Martin Jungfer

  • Charging without a cable: why the best iPhone charger isn’t made by Apple

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    by Lorenz Keller

  • Too Many Portable Power Stations? Here's How to Choose the Right One

    Buying guide

  • Testing powerbanks for everyday use: 10 models, one surprising winner

    Guide

    by Lorenz Keller

  • Here’s why batteries have strange designations like CR2032

    Background information

    by Martin Jungfer

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