2S1PA123-2500: 6.6volt 2500mAh rechargeable Li-Fe battery for R/C electric motor applications.. Size: 2.75" x 2.1" x 1.1". Weighs about 6 ounces. Includes Balance charge connector, and choice of Motor Connector (red T, XT60, EC3, EC5, Tamiya, PowerPole,. Made with Genuine A123 Systems Nanophosphate ANR26650M1A LiFe cells.