Battery Not In Position ( NodeB Alarm)

My friend inform me about this, TroubleShooting   Battery Not In Position

1. Make sure LAN Cable (alarm) from COM IN cabinet battery connect to COM 485 at PMU are connect properly.
2. Make sure Battery Installation correctly, then Power cable battery connect to PDU (Power Distribution Unit) 
3. Switch off Breaker Power AC approximately a two minute, and make sure Node B running on used back up Batt ery, then turn it on again by Breaker Power AC