This Portable Car Battery Booster Is a Roadside Lifesaver
Briefly

Few things can ruin your day as suddenly as trying to start your car and being met with the dead silence of a dead battery.If you're unlucky, your best bet is to find someone else with a functional car and some jumper cables to help get yours running again.If you're prepared, though, you can handle it in seconds.
Read at WIRED
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