I have seen there are some interesting batteries at BMSbattery:
http://www.bmsbattery.com/battery-pack/664-36v-12ah-38140-lifepo4-battery-12-cells-ebike-battery-pack.html
From the specs, they are light, small, powerful and cheap.
It seems they are the same battery used for:
http://www.bmsbattery.com/48v/655-48v-15ah-lithium-ion-alloy-shell-ebike-battery-pack.html
Has anybody tried them?
Edit: I believe they are using the following cells:
http://www.bmsbattery.com/battery-cell/626-high-c-rate-10ah-lifepo4-cells.html
http://www.bmsbattery.com/battery-cell/640-high-c-rate-10ah-lifepo4-cells.html
http://www.bmsbattery.com/battery-pack/664-36v-12ah-38140-lifepo4-battery-12-cells-ebike-battery-pack.html
From the specs, they are light, small, powerful and cheap.
It seems they are the same battery used for:
http://www.bmsbattery.com/48v/655-48v-15ah-lithium-ion-alloy-shell-ebike-battery-pack.html
Has anybody tried them?
Edit: I believe they are using the following cells:
http://www.bmsbattery.com/battery-cell/626-high-c-rate-10ah-lifepo4-cells.html
http://www.bmsbattery.com/battery-cell/640-high-c-rate-10ah-lifepo4-cells.html