Maximize Battery Life with a Joule Thief

By Jason Fitzpatrick on June 2nd, 2011

When your batteries are too weak to power your digital camera (or flash/game device/etc.) that doesn’t mean they’re totally dead. Make a Joule Thief to use every last bit of stored energy.

A Joule Thief is a simple circuit designed to draw the last bit of power out of a battery using a low load device like a low-voltage LED. Instructables user 1Up got the idea from Make magazine and then tinkered with and refined the idea. His design doesn’t include an enclosure but it’s a great start to a larger project–perhaps a “dead” battery powered nightlight?

Make a Joule Thief [Instructables]

Jason Fitzpatrick is a warranty-voiding DIYer who spends his days cracking opening cases and wrestling with code so you don't have to. If it can be modded, optimized, repurposed, or torn apart for fun he's interested (and probably already at the workbench taking it apart). You can follow him on if you'd like.

  • Published 06/2/11
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