Battery Statistics
CALB CALB-LFP40AHA - 3.2 volt 40 AH
LiFePO4
$50 USD
Voltage range: 2.0V - 3.6V
Current (max): 160A
Power (max): 512 W
Weight: 3.09 lbs
Size (inches): L-4.53 W-1.81 H-7.05
Volume: 57 cu-in
Total energy: 128.00 watt-hours

Links...
CALB (Sky Energy)
CALB-LFP40AHA spec sheet
Cost: 2.56 Wh/$ ($ 0.39/Wh)
Weight: 41.47 watt-hours per lb.
Volume: 2.22 watt-hours per cu-in
Cycle life...
2000 cycles @ 80% DOD - 204.80 kWh
3000 cycles @ 70% DOD - 268.80 kWh
Life cost: $ 0.24/kWh
165 watts (max)/lbs.

Charging Information...
Voltage (max): 4.0 V
Current (max): 12 A
Power (max): 48 watts
Build a pack with this battery...

Series batteries: Parallel batteries:
Cost: $
Watt-hours per mile:
Optional pack title:
Metric

http://www.zuglet.com/batteries/batteryPack.php?id=1022&cost=50&whpm=400