The Wind Up Rechargeable Battery stores your kinetic energy for later use. Actually it’s perfect for those of us who can’t sit still. Just crank on this for a few minutes every now and then, and bingo, lots of spare power for the MP3 player or phone. OK, so 2 minutes cranking for 6 minutes talk-time is not stellar conversion rate, but it’s better than nothing. $39.99. Fully-charged, it can provide 2-5 hours of power for MP3 players, 5 hours…
Continue Reading »Wind Up Rechargeable Battery – power when you need it, your wrists when you don’t