Are you looking for an inexpensive way to power a project? Have you thought of using an old laptop battery? There are seven projects on how to use a laptop battery to power things like quadcopters, LEDs, and more, reet 'ere at:
I was thinking the article could be a bit misleading. Old laptop batteries could be NiCad 1.2v or NiMH 1.2v-1.5v. Newer laptop batteries are usually Li-ion 3.7v-4.2v. Beware there are some 3.6v Li-ion batteries 3.6v-4.1v, so don't apply 4.2v to these.
To test batteries properly you need something like a wear level meter. These can be expensive. Usually if the wear level is below 60% the battery is done for. The Laptop Battery Analyzer /Recycler project seemed good though.
The cheap way to test them is charge them individually and test them. Cheap chargers for all types of batteries can be found on eBay, usually from China though.
On a laptop PC you can test your laptop battery with CPUIDs Hardware Monitor.
Be careful when dismantling the batteries as they may still have a near full charge in them. I have tried repairing some packs where the dead cells could be identified with about 50% success. Probably cheaper to buy a new one.
Don't just throw them in the bin. Take them to a proper recycling centre. We store all our old batteries up (including phone batteries) and take them to the local tip about once a year. Your town hall should also have a place to put them. Batteries are death to land fill sites.
Last Edit: Feb 15, 2016 0:46:31 GMT by tiw: missed a line
2x 1200XL, 1x 800XLF, 1x 130XE NTSC, 2x 1050 and 1x sio cable, 3x STE, 2x XBox 360, 1x EVGA SR2 2x6core 40GB. 1x Z10PE-D8-WS 2x 8core 64GB (AKA Rommie). Various laptops and a few other PCs. Working on upgrades.