Kipor 3500 Watt Electric start Quiet generator

Battery is dead and won't hold a charge. It's 44 degrees in my garage and starts in 2 to 3 pulls, the first start since September. If i were camping/tailgating all the time id worry about the battery. I don't so the battery lasts maybe a year before it goes dead. She has a full tank of stabilized fuel. I rebuilt the carburetor when I bought it some 5 years ago. I also changed the fuel peatcock but couldnt find one that fit exactly, this is very close to a Honda eu3000 or eu3500 so I put one of those in it, the on off valve doesnt fit exactly but it works. I changed the oil and I run it every 3 to 6 months for about an hour. Will run up to about a 14,000 btu air conditioning unit on an RV. Older units may need a soft start capacitor installed to start the compressor without tripping the breaker. I work on equipment like this for a living so it kept in good shape, dirty but good shape. I now have some portable suitcase generators they link parallel so i don't need this one. This has wheels on it but still needs 2 people to lift onto the truck bed. It also sucks to roll on dirt or grass. 600 is firm on price. I don't need the cash so I won't lower the price, I'll wait for another mass power outage from ice or storms and sell it then.