The Schumacher Fuel Packs, Nos. SL3, SL4 and SL5 are part of the Red Fuel line of Li-ion products. Products in this line offer spark-free protection agains short-circuit, overload, over-current, over-voltage and overcharge events. The SL3 has an LED indicator and can charge most USB devices through the 1A USB port. The SL4 includes a power button and LED indicators for charging and battery status, and 2A plus 1A dual USB ports for twice-as-fast charging for all USB devices including smartphones, mp3 players and tablets. The SL5 offers the same featurs as the SL4, but also includes a digital LCD backlit display for charging and battery status and a kinetic wake feature to allow quick status on battery capacity. All fuel packs are available in five color options.
