I put together a LiFePo4 3.2V 20ah (60v all together) pack from Hangzhou Liao:
http://hzliao.en.alibaba.com/product/673618911-215253674/LiFePo4_3_2V_10ah_battery_cell.html
The batteries actually came with a bare metal case (no protective sleeve). I didn't think much of it and continued to put...