you may not get the full 8 hours of warmth if it’s too cold outside. If you want a more reliable product no matter the temp, try the Ignik Hand Warmers, or if you want a longer-lasting battery ...

Somehow, all that typing and mousing does little to warm things up. What you need are hand warmers, obviously, and they might as well be smart and made to fit your hands. Fifteen-year-old ...

Here at Backpacker, hand warmers have a fan club ... If you don’t need them for the full six to 10 hours the reaction can last, you’ll likely end up wasting them. Luckily, there’s an ...

The first 'reaction' that we tried for our hand warmer involved dissolving potassium carbonate (K 2 CO 3) in water. Potassium carbonate is one of the chemicals left behind in the ashes of burnt wood.

Hand warmers come in handy when you’re working outside, hiking in the winter or shoveling out your driveway. You can get a 10-pack of disposable hand warmers on Amazon. They provide hours of ...

Not so the Lifesystems rechargeable hand warmer – you charge it via USB, which is a much simpler option if you're away on a trip. Charging takes around four hours, from low power to full ...

To enable this, [Greg] 3D printed a small crate with plenty of vents, into which he stacked six hand warmer sachets. An egg was nestled in the center – a perfect choice as it can be cooked in ...