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For anyone interested in building this, the relevant files should appear on the wiki soon. Its fairly straightforward, but does use all smd parts, so if you haven't worked with these before, bite the bullet and get into it! I reckon smd's are easier to assemble than thru-hole parts, once you get the hang of it.
I do have pcbs available and also can supply them with the micros mounted and programmed if you wish. Send me a PM if interested, although all the info needed to make your own is included.
A quick overview:
Each cell has its own module which bolts directly to its terminals. These modules use a PIC micro to measure the cell voltage and temperature, and the have a 6R8 shunt which can be turned on or off for balancing. The controller talks to all of the modules via a "daisy-chain" comms link and collects voltage and temperature data. It displays the max and min values on a LCD and also the total battery voltage. It also controls cell balancing via the shunts and by controlling the charger.
Have at it!
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Sometimes I sits and thinks and sometimes I just sits.
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