We tested how much heat five of the most popular rechargeable hand warmers produced, and how long their batteries lasted.

Depending on how long you’re out and how cold your hands get, picking the correct type of hand warmers for your needs can be ...

They’re affordable. If you buy the warmers in bulk, they cost about 75¢ per pair. (A full box is about $30 for 40 pairs.) The HotHands Hand Warmers come two to a pack. Michael Hession/NYT ...

Temperatures of each hand warmer (in Fahrenheit) from the first minute of activation until their temp dropped below 100 degrees. I ran a separate test of the best electric hand warmers and the best ...

If you're over those squishy, shake-activated hand warmers and want something a little more high-tech for those chilly ...

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.

Ignik Hand Warmers ($10 per 10-pack ... Also, like Hot Hands, you can often find them on sale in bulk, so if you burn through ...