Battery laser cannon is a passive skill, which can only be learned if it is equipped with level 5 laser cannon. Only 1, laser cannon is an active skill, full level 20. After learning the gas storage laser gun, the laser gun can only hold down Z without releasing gas storage. Gas storage will increase the damage of the laser gun, so the laser gun should be filled with gas. However, if you choose fashion, you must add the stored laser gun to the level of 1, because this can improve the speed of removing damage.