Fit to 3.6V or 3.7V Lithium battery in different size
Reverse polarity protection
Activation function
Auto-detect charging function
Over-charging protection
Short circuit protection
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.
