Soldier Portable photovoltaic Power Pack for the Lithium Ion BB2590. solar charge system was designed by Global Solar Energy andBren-Tronics Battery to provi de soldiers a portable generator for the new Lithium Ion BB2590. It has been tested by US ARMY CECOM and is ready to deploy to soldiers in need of portable power. Tactically Silent, Renewable Power, Anti-Reflective, Camouflaged, Unbreakable, Charge Batteries and Power Portable Electronics. Can use P3-55 or P3-62. Lightweight - weighs 4 lbs. vs. over 25 lbs.for glass.