What batteries does the NFS2-640 use, and what does the BAT. BACKUP RAM trouble indicate?
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The NFS2-640 uses two 12-volt batteries with a capacity range of 18 AH to 200 AH (Page 4) [1].
A separate cabinet is required for battery configurations exceeding 26 AH [1].
The BAT.BACKUP RAM trouble message indicates that the RAM battery backup is low and the battery must be replaced (Table D.2) [1].