What is the procedure for replacing standby batteries on the N16, and how does the panel report battery trouble?

Replace batteries every 5 years or if terminal voltage drops below 21.6 VDC during a load test (Page 59) [1].

The N16 reports battery issues through a yellow Off Normal LED, a sounder pulsing at one beep per second, and specific display messages such as "Battery Low or Missing" or "Charger Fail" (Page 11, 63) [1].

Replacement Procedure

1. Notify the fire department and building personnel before beginning service (Page 63) [1].

2. Remove AC power and perform a load test; if voltage is below 21.6 VDC, the batteries must be replaced (Page 59) [1].

3. Disconnect the battery interconnect cable before removing the old batteries (Page 25) [1].

4. Install new sealed lead-acid batteries and ensure AC power is applied to the panel before reconnecting the battery interconnect cable (Page 25) [1].

5. Connect the battery cable to TB9 on the PMB or PMB-AUX, observing correct polarity (Page 25) [1].

6. Allow new batteries to charge for 48 hours to reach a full state of 27.6 VDC before performing subsequent tests (Page 59) [1].