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That's a really good idea about the batteries from old phones. I bought a bunch of old laptop batteries, and removed the Li-ion batteries (and NiMH in some). Even though the laptop batteries weren't any good, it was often because a couple of the batteries were bad. There were usually 6 or 9 18650 Li-ion batteries in each laptop battery, and I found that most of them were typically good. I made a spot welder, and made a 36v 8.8 amp*hr battery pack for my bike using some flat nickel stuff. I ended up selling them, but I bet with collecting lots of old laptop batteries, 60-80% of the 2.2 amp*hr 3.6v batteries are still good. It only takes about 6800 of them to power the Tesla!
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