The Mega Lithium BackPack is an Open Source Hardware battery shield for the Arduino Mega that snaps to the back of the board, and provides around 15-27 hours of battery power to circuits built with the Arduino Mega (depending on the circuit). It gives a 3.3 volt, 5 volt, ground, and battery capacity testing signal […]
This Instructable shows you how to build a lighter-based 12v battery trickle charger made from a laptop power supply, a LM317T regulator, and an Altoids tin (and some other misc components). Car Battery Charger from Spare Parts in Mint Tin
Don’t want to pack away all those fun colorful Christmas lights? Check out this informative writeup on how to use holiday lights with battery power. It was written primarily for the bulb based lights, but LED strings should work even better than the bulbed ones. Remember that each bulb uses half a watt-hour per hour. […]
Don’t let that dead laptop battery ruin your life. Repacking a old ibook battery with new cells is a easy operation. Within 10 minutes and $30 you can have a battery that lasts twice as long as the original. Here’s the video, complete with catchy soundtrack: Of course, exercise due caution when making your own […]
Here is a super small, sneaky storage device for your secret stuff. Thanks go to Andrew Lewis for the original article in Make: Volume 16 To download The USBattery MP4 click here or subscribe in iTunes. Check out the complete USBattery article MAKE 16 “USBattery”and you can see that in our digital edition.
Turn a spent AA battery into a secret USB data stash.
Here’s an Instructable on building primitive batteries, interesting not so much for its (low-current, low-voltage) results but as a nice overview of a different way of making batteries. Also check out this Wikipedia entry on earth batteries, which I found via this Instructable.
