MINET Battery Back Up (BBU) A BBU is used as a back-up for analog phones when power is down. The battery in it is not required and can be removed and taken to the MINET office for recycling. Only older BBUs will have a battery. If the unit has a red light it means the battery is dead or not in the unit. You are responsible for monitoring the status of the BBU and for ensuring that the battery is charging normally. Battery Status Light Conditions: • Green and flashing: The installed battery is charging, it will take a few hours for the battery to fully charge. • Steady green light: Indicates a fully charged battery. • Amber light: The battery is discharging or not able to charge. The battery should be replaced. • Red: The battery is dead or absent from the BBU.