A high quality HV battery (charges up to 4,35 V per cell), capable of high current discharge up to 75C (22.5 A) continuous. We add also the more common JST connector. If you decide to solder it to the battery, be extreme cautious - especially do not short circuit the power leads! If you cut the leads to remove the original connector, you have to cut each lead separately, not both in the same time! This might destroy the battery or cause fire or other damage.
Read safe use of Lipo batteries before use.