New 1500Mah 2S1P NANO-TECH batteries with good discharge characteristics, try them! Here are some specs: Weight (Grams): 91gr - Dimensions (mm): 14×35x85 - Max continuous current: 35C (52A) - Max burst current: 70C (105A). XH type balancer cable preinstalled. Can be charged up to 5C. XT60 connector presoldered.