For those willing to put some elbow grease into it, there is an almost unlimited supply of 18650 lithium ion batteries around for cheap (or free) just waiting to be put into a battery pack of some ...

[Editor’s note: The hacker requested that we remove the image for legal reasons, so it’s blurry now. We hope all’s well!] Lithium technology has ushered in a new era of batteries with exceptionally ...