Dual 3-Slot Battery Charger Connected via Y Cable. Compatible printers include ZQ610, ZQ620, ZQ630, QLn220, QLn320, QLn420, QLn220 HC, QLn320 HC, ZQ510, ZQ520. Dock and charge up to six PowerPrecision+ Li-Ion printer batteries at a time. The dual 3-slot battery charger ships with a power supply, Y-Cable and country specific power cord. Works with both standard and extended battery packs.