My Duromax's have been good starters. Both my '10 and now my '16 start good. I seldom plug them in. Started mine yesterday just to let it lube up, it has sat in front of the shack for a week and not ran. Stuck the key in yesterday and cranked it over and she started right up. Run 15-30 in it as well. If they crank over they start. It's not common practice to not plug in your vehicle but like I always say, My father never had a plug in for his equipment in the bush and he used to get nothing less than 25,000hrs out of his Cat engines. Let them warm up before use is the trick.