Type A(short battery)
Type B(long battery)
Silver, Black, Purple, Blue
Short-circuit Protection: When short-circuit occurs while smoking, the LED will long light (lasts two seconds) to stop outputting.
Low-voltage Protection: When the voltage of battery is below 3.3V, the LED light will successionally blink ten times to enter a sleep state.
Charging Protection: When charging voltage reaches the set voltage, it will cut off the charging circuit automatically and the LED will flash 10 times.
Lock-state in circuit Protection: Use its charger when charging to unlock the battery.