Power supply

  • A different price every 15 minutes: I’m buzzing to try out these new electricity tariffs

    Background information

    by Martin Jungfer

  • Here’s why batteries have strange designations like CR2032

    Background information

    by Martin Jungfer

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

    Guide

    by Lorenz Keller

  • With these tips, your car battery won't go flat in winter

    Guide

    by Lars Petersen

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

    Buying guide

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