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3Ah 7.2V Battery/Charger For Dremel 757-01 7700-01 7700-02 Not For 770 Type1 757 | eBay
Amazon.com : Upgraded Powerextra 2 Pack 7.2 Volt 2000mah Battery Compatible with Dremel MultiPro Cordless Rotary Tool Models Dremel 7700-01 and Dremel 7700-02 Replacement Dremel 757-01 Dremel 7.2 volt Battery : Tools & Home Improvement
CREABEST 2Packs 7.2V 3.5Ah Ni-MH Battery for Dremel MultiPro Cordless Rotary Tool Models Dremel 7700-01 7700-02 757-01 with One Charger - Amazon.com
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 - Walmart.com
Hacking together a better dremel battery! - YouTube