The Husqvarna QC500 Charger is optimized for fast charging of Husqvarna backpack batteries, plus the integrated BLi300 battery. 500W output with active battery cooling charges batteries up to 50% faster than our QC330 charger, cutting downtime as it increases productivity. The Husqvarna QC500 Charger is optimized for fast charging of Husqvarna backpack batteries, plus the integrated BLi300 battery. 500W output with active battery cooling charges batteries up to 50% faster than our QC330 charger, cutting downtime as it increases productivity.