Star Wars: A Flicker of Hope
Pulse Charger Weapon Upgrade
Any blaster weapon can be fitted with a pulse charger. A pulse charger forces more power into the blast chamber, producing more powerful shots at the expense of lost accuracy this upgrade causes a -1 penalty on all attack rolls with the weapon, but the weapon deals +1 point of damage per die. Thus, a sporting blaster pistol with a pulse charger imposes a -1 penalty on attack rolls and deals 3d4 +3 damage on a hit. A blaster with a pulse charger has only one-half the normal number of shots from a power pack.
Source: Scum and Villainy, p. 43