Rechargeable Li-Pol Battery Packs EPS3 is designed to power Pulsar and Yukon digital devices, thermal imagers and night vision riflescopes. Battery Packs can be used with such devices as Digisight N550, Ranger 5x42, Recon series and other equipment outfitted with an external power supply and Weaver rail or ¼” socket. The EPS3 features a high capacity which significantly-up to 9 hours-increases self-contained operation of external equipment. A built in weaver mount allows you to attach the battery to the unit itself or a rail. Thanks to the supplied connector for devices with car lighter adapter, battery packs are suitable to power various external devices like GPS navigation, FM modulator, mini TV set and cell phones.