The robust KRESS 20V Max KROSSPACK® 6.0Ah Lithium-Ion Battery features a battery charge level indicator showing the remaining battery charge. It includes built in intelligence which protects against over/under-voltage, maximizes charging & discharging current, & operating temperature range. Also features a cooling system for active temperature management; effectively reducing battery temperature, equalizing battery temperature, and prolonging battery life. The KAB24 20V Max 6.0Ah Battery is compatible with all KRESS 20V Max Products.