The Phylax battery with 7.4V and 1,450mAh has a mini-Tamiya connector. It delivers a release value of 25C and measures approx. (LxWxH) 11.5cm x 1.6cm x 1.3cm. So it fits into most stock tubes.

ATTENTION: with LiPo batteries it is imperative to use LiPo chargers with a built-in balancer. Lithium polymer batteries are electrically and thermally sensitive: overcharging, deep discharge, excessive currents, operation at temperatures that are too high (greater than 60 °C) or too low (less than 0 °C) and storage in a discharged state damage or destroy the cells in most of them cases. Only use with S-AEG weapons that are also specified as LiPo ready.