Battery Statistics
RealForce (Shandong, China) RFE-F100 - 3.2 volt 100 AH
LiFePO4
$125 USD
Voltage range: 2.0V - 3.6V
Current (max): 100A
Power (max): 320 W
Weight: 8.38 lbs
Size (inches): L-6.57 W-2.64 H-10.31
Volume: 178 cu-in
Total energy: 320.00 watt-hours

Links...
RealForce
RFE-F100 spec sheet
Cost: 2.56 Wh/$ ($ 0.39/Wh)
Weight: 38.20 watt-hours per lb.
Volume: 1.79 watt-hours per cu-in
Cycle life...
2000 cycles @ 80% DOD - 512.00 kWh
3000 cycles @ 70% DOD - 672.00 kWh
Life cost: $ 0.24/kWh
38.20 watts (max)/lbs.

Charging Information...
Voltage (max): 4.0 V
Current (max): 20 A
Power (max): 80 watts
Build a pack with this battery...

Series batteries: Parallel batteries:
Cost: $
Watt-hours per mile:
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http://www.zuglet.com/batteries/batteryPack.php?id=1041&cost=125&whpm=400