Thursday 1st January 2026
    Difficulty: Medium

    Recharge (#1,140)

    Photo by <a href="https://unsplash.com/@andyadcon?utm_source=unsplash&utm_medium=referral&utm_content=creditCopyText">De an Sun</a>
    Photo by De an Sun (Unsplash)

    1. How much does it typically cost to charge the battery of a mobile phone (or cellphone, for our American friends)?

    2. How much would a full charge of a Tesla Model Y's battery cost, if done using your own home electricity supply in the UK (in round figures)?

    3. If you have an electric shaver with a built-in rechargeable battery, which of the following should you NOT do to maximise the life of the battery?

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