http://stores.headway-headquarters.com/StoreFront.bok
They have them on Ebay also, but nothing local.
They sell the case and the hardware too.
I didn't have the smaller wire jumpers, so I made those.
More info? Specs maybe?
Headway 38120S(10AH) No.
Item
Specification
1 Normal capacity 10000mAh
2 Normal Voltage 3.2V
3 Inter Impedance <6mΩ
4 Maximum Charge Current 6C(60A)
5 Maximum Charge Voltage 3.65±0.05V
6 Maximum Continuous Discharge Current 10C(100A)
7 Maximum Discharge Current 15C(150A)
8 Discharge Stop Voltage 2.0V
9 Dimension Diameter 38±1mm
Height 122 ±1mm (132±1mm)
10 Weight Appro. 300g
11 Cycle Life
1500 cycles 1C 100% DOD
2000 cycles 1C 80% DOD