Blinky Lithium Battery Balancer: A123 This is the Astro Flight "Blinky" 123 Battery Balancer for 1 to 6 cell 123 battery packs.Features: Accepts one to six cell 123 battery packsNow you will know when your batteries are balancedNow you can balance your pack while you are chargingConnector has .100mm in pin spacing and .025mm square pins and fits Apogee and other brandsDesigned for use with A123 Lithium Ion BatteriesIncludes: One Astro Flight Blinky LiPo