Dremel Battery Pack for 7700 Series Rotary Tool, 7.2V (Dremel 757-01) | HomElectrical.com
Amazon.com: Hanaix 7.2 Volt 3500mAh Battery Compatible with Dremel 7700-01 and Dremel 7700-02 Replacement Dremel 757-01 Dremel 7.2 Volt Battery (Do not fit Dremel 770 Type 1) : Tools & Home Improvement