Smart Digital Battery Nano 2S Battery Pack is the premier battery pack made from non-memory and high capacity Lithium-Ion batteries. Different from other analog battery packs on the market, it contains CPU microcontroller that regulates charging, constant LED power, audible indicator 10 minutes ahead of shutdown, battery status indication, auto wire fault sensing/warning and overheat self protections. It is the longest running headlight battery on the market with the smallest form-factor and incredible durability. Unlike other analog dial battery, NanoRead more