Universal Power Group 12V 7.2AH SLA Battery Troybilt TB55B 12V String Trimmer UPG # 40800 UB1270 12V 7Ah Dimensions: 5.94 inches x 2.56 inches x 3.86 inches. Weight: 4.80 Lbs SLA/AGM maintenance free, spill proof battery Rechargeable battery that can be mounted in any position, resists shocks and vibration 1 Year Warranty