EP-4200SC : 1.2 volt 4200mAh rechargeable NiMH High-Output Sub-C battery cells. Rated to 30C. Choose Plain (no Tabs) or with Solder Tabs (for assembly - $0.25 extra per cell; one tab welded to top of cell and one tab welded to bottom of cell). Battery dimensions: 1.75" tall x 0.88" diameter.
Pricing is for 1 battery. Picture shows two aspects of the battery cell.