Battery Safety Protections: Built-in protection against overcharge, over-discharge, over-current provides short- circuit protection and constant voltage circuit. LED Charge level indicator: Power display can show remaining power in order to avoid over-charging & over-discharging.
What's in the box: 2 * 6.0Ah 18V Battery Replacement For Mak, 1 * 18V Replacement charger, 1 * User Manual, Provides 30-days money-back and 12 months of after-sales support, and 24hrs friendly customer service.