Source: Starfinder Core Rulebook p.72
As a standard action, you can use your custom rig to overcharge and attack with a ranged energy weapon or a melee weapon with the powered special property that you're holding. If you hit, you deal 1d6 additional damage of the same type the weapon normally deals. This attack uses three times as many charges from the battery or power cell as normal and can't be used if the weapon doesn't have enough charges. This trick has no effect on a weapon without a battery or power cell. You can instead use this ability as a move action on a touched powered weapon that is unattended or attended by an ally to grant the same effect to that weapon's next attack before the beginning of your next turn.