http://tinyurl.com/m2nf332
Combo: 15 pcs Tenergy Sub C 2200mAh NiCd Rechargeable Battery for Power Tools (w/ Tabs)
High quality Sub C Size rechargeable NiCd battery. Flat Top.
Designed for enhanced performance for high drain applications
Provides long use time per charge with this high 2200 mAh capacity
Dimensions (Diameter x Height)23 x 43 mm
Enable cost effective and easy way to make your own power pack of different voltage and shape