holabr
Member level 2
I have a small UPS (APC Back-UPS 350) that has a 12 volt 7aH battery. I use it to keep my router and cable modem up and running in case of a power outage. I recently got a couple of Group 24 wheelchair deep cycle batteries. Can I connect these in parallel to the 12 volt battery in the unit to greatly improve the up time of the UPS? Do I need to provide a seperate battery charger/tender for the Group 24s and somehow "isolate" them from the UPS? What other considerations are there? I don't want to burn up the UPS.