Powerextra 7.2 Volt 2000mAh Battery Compatible with Dremel MultiPro Cordless Rotary Tool Models Dremel 7700-01 and Dremel 7700-02 Replace for Dremel 757-01(Do not fit Dremel 770 Type 1, 770T2, 7300) - - Amazon.com
Dremel 770 Type 1 Battery Repair / Replacement - YouTube
West Auctions - Auction: Online Auction of Telehandler, Ford Trucks, Fishing Boat, and Construction Equipment ITEM: Dremel MultiPro 7.2V 2-speed Cordless 770 & Charger