Replacement Battery Pack For ATD-80360A & ATD-80390A Tube Lights Battery Pack Features: . Replacement battery pack for use with 80360A or 80390A SABER Tube Lights . LED battery indicator shows battery level and charging progress . Rechargeable 3.65V, 4000mAh lithium-ion battery . Fully charges in 3 to 4 hours 4000mAh USB Power Source: . Battery pack can also be used to power mobile phones, tablets, MP3 players, and more . Requires device USB cord when charging electronic devices Battery Pack Charging Instructions: . Connect USB Type-C cord (included with SABER Tube Light) to either a 5V AC adapter with 110-120V wall outlet, a 12V DC power source, or a 5V DC USB port . After connecting to a power source, at least one of the LED lights will start blinking, indicating that the battery pack is being charged. *eg. Two solid LED lights is equal to 50% charge . When all four LEDs stay steadily lit, it indicates the battery pack is fully charged and should be disconnected from the power supply 80391