List Price: $335.00 Deal Price: $99.99 You Save: $235.01 (70%) The PS50-2A uses 12-Volt Max Litheon batteries with unmatched battery runtime and a 400-percent-longer lifetime than traditional lithium-ion batteries. In fact, two battery packs should allow you to perform primary applications without down-time. Litheon batteries are the most advanced lithium-ion batteries available today. They allow more battery charges and provide longer runtime without memory effect--meaning the batteries do not need to be empty before charging. Expires Jan 30, 2010