I want to put together 12 Lithium batteries. I'd prefer Lithium-Ions, but the size I'd like (42120) only appears to be available as LiFePo's. There is no pre-made battery box that fits the shape requirements I would like to contrain myself to.
I am reasonably technically savvy, but I know very little about battery-pack fundamentals.
In any case, assume, for the moment, that I have convinced you that building my own battery pack is a worthwhile idea.
How do I put these together? I don't have a hub, but right now I was thinking about running a 36V hub, and straight-foward-ly stringing the batteries together in series... but I assume, for recharge and optimal life, I should somehow balance these, right? So I should solder them together, but also run leads to each connection, so that I can monitor the voltage, correct?
Is there an off-the-shelf discharge/recharge controller? An off-the-shelf monitoring system for the bike (fuel gauge)? Am I missing something else that's obvious?