Backup Battery

• When powering a module network, it is important to have a backup battery connected to the power supply
• A backup battery assists the power supply by offering additional current when required (if a lock is faulty or a short is created across a device within the network)
• It also conditions the power supply by filtering its output

When linking a battery and a PSU, it does not matter what order the battery and the AC are connected, but the AC must be connected for the PSU to be powered.