7 Best Portable Battery Chargers (2021): For Phones, iPads, Laptops, and More


Many years ago, the Samsung Galaxy Note 7 became famous when its batteries burned out in a series of incidents. There has been a steady flow of the same, albeit isolated, incidents since then. However, despite the fact that the batteries are faulty, most Li-ion batteries are safe.

The chemical reaction that takes place inside a lithium-ion cell is complex, but like any battery, it has a negative and a positive electrode. In lithium batteries, the negative is a lithium-carbon compound, and the positive is cobalt oxide (even if many battery makers are switching from cobalt). These two compounds cause a reaction that is safe when controlled and can energize your devices. If you can no longer control the reaction, you end up melting the earbuds in your ears. What transforms a safe reaction into an uncontrollable reaction can be anything: excessive heat, injury to the body while in use, injury to the body while working, or use of the wrong charger.

The three basic rules that have kept me safe (so far) by testing dozens and several batteries are:

  1. Avoid cheap cords, chargers, and outlet adapters.
  2. Make sure the batteries are not exposed to excessive heat (above 110 degrees).
  3. Always check batteries for signs of damage.

Avoiding cheap wall-outlet adapters, cords, and chargers is paramount. This is likely to get you into trouble. Those chargers you find on Amazon at $ 20 cheaper than the competition? Not worth it. Maybe they got the price by saving on isolation, abandoning power management tools, and ignoring basic electrical safety. Price alone is not a guarantee of safety. Buy from reputable companies and brands.

Then there is heat. Too much of it can cause all sorts of problems, both in terms of exit and part of safety. Avoid heat, and pay attention to your batteries when they are charging. If your device gets too hot on charging, it could be a sign of problems. Similarly, watch out for any swelling, bulging, or otherwise faulty battery charging.



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