Venom Fly 30C 1S 250mAh 3.7V LiPo Battery with Micro Losi and JST Plug x4 Pack Combo Fits Models Like: Estes Dart, Heli-Max ISQ, Hubsan H107C, Protocol Slipstream, and Traxxas QR-1 Venom Fly - Engineered for Flight, with "A" Grade Matched Cells for Unrivaled Performance. Spend Less Time Charging and More Time Flying. 5C Charge Capable for Significantly Faster Charging. Plug Type: Micro Losi and JST Backed with Proven US Support and Venom&apos;s Industry Leading Lifetime Battery Replacement Plan.