The GPU 2000 is a portable battery pack that provides 2000 amps of peak power. It is designed for use on helicopters and small aircraft with shaft turbines. Some key features include a 38 amp/hr capacity from two 13V battery cells in series, ambient temperature operation from -40°C to +40°C, and dimensions of 450mm x 440mm x 110mm. It can be connected in parallel with another GPU 2000 unit to double its capacity and power output.