SP Studio Systems Battery Pack with Charger for Lancerlight AC & 12 volt DC Monolight Flashes. Rechargeable with the 18 volt, 600mA AC/DC Adapter Supplied. Output: DC 305 volts, 500mA. Battery Capacity: DC 12 volts, 2.3 Ah. Size 8 5/8" x 4 13/16" x 1" Weight: 3 Pounds. Approximate Flashes Per Charge: 270ws Unit - 110 Flashes. 160ws Unit - 190 Flashes. 100ws Unit - 320 Flashes. 70ws Unit - 380 Flashes.