What batteries are recommended for use with the LP1501 PoE Door Controller and Power Supply Kit (ADC-AC-LP1501-PSE)?

The FPV4 requires that the battery set voltage must match the DC output voltage. Per the ADC-AC-LP1501-PSE Door Controller and Power Supply Kit's requirements, the FPV4 should always be set to 24V in order to provide enough voltage to the B100 to properly power the Door Controller.

The ADC-AC-LP1501-PSE kit allows enough space for either two 12V @ 4Ah batteries or two 12V @ 7-9Ah batteries. The expected battery charge output from the FPV4 will be approximately 26.5V to 27V. The following image observes the appropriate battery configurations: 
 

Note: There is no voltage on the FPV4's battery terminal without a battery connected. If a battery is connected and then disconnected, the FPV4 will detect the change and shut off the battery charging circuit after 1 minute.