You very well may be right. Still investigating. There is a consensus here that when the inverter switches to D.C. that shutdown must occur before the battery reaches < 50% charge. I am reading my manual now, since my inverter is programmable, to find out if there is such a setting and I'll report back. Even if there is such a setting, it could be that it's too late for the status of my present battery. And I don't know what it means when the inverter says 100% charge and I got 18 hours of use a year ago, and now it says 100% charge and I get one hour. Be that as it may, I don't have the money at this time to buy a new battery or batteries, so I'll just have to go without.I do not really understand your question so I reread your OP. Having stated that you suffer through a lot of power outages, it follows that your inverter attempts to recharge the single battery after every outage. I don't see where "if I have not recharged my inverter's battery one time, why can't I do that?" comes into play. If you are only getting 1 hour of backup power from that battery, it is clearly toast and needs to be replaced. I don't know how your inverter knows to stop charging and report the batteries at 100% so I won't guess. Regardless your battery is charging to no where near 100%. All of the advice given pertains to getting the longest useful life out of your system but once the battery stops working well, there is nothing you can do to "rejuvenate" it. Not what you want to hear but I see a shopping trip in your future. Want your inverter to be able to supply power during an outage for longer that it does now get a new battery. Want to prolong the useful life of your heavily worked battery and enjoy an even longer period of backup power, buy and connect more than one new battery.