Auto-stop when fully charged & auto-recharge when voltage lower than 4.05V
4 kinds of protection over-discharging, over-voltage, short-circuit and reverse polarity protection
The batteries at or over 0.6V can be activated by Q4 charger
Battery slot monitors independently
HIGH QUALITY: Spring made by piano wire, it provides a smooth sliding action when installing and removing batteries. Steel cathode with low resistance and hard chromium plating processing to achieve a more precise charging voltage. 15,000+ times spring testing quality warranty.