How tp assemble a bike light, with 10W halogen, and 3.5Ah 7.2V lithium ion battery pack.
Li-Ions are a little more delicate than most batteries and must not be over or undervoltaged. I use prepackaged batteries with protection circuitry inside. I would hesitate to use bare-back cells, as fires suck. Regardless, Li-Ions dislike giving burst charges, so you can't just connect your lamp to a battery with a resistor (or potentiometer) in series, as halogens will current-spike (5A? 10A?) if voltage controlled. Therefore you must use a current-control scheme as presented here.
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http://www.ladyada.net/make/bikelite/index.html
