Today, went out to my garage to start the lawnmower. Battery was deader than a door nail. I got the mower in 2012 and the original battery only lasted a few years. But just can’t remember the year. I got this Duracell Ultra battery then that lasted till now. I doubt Duracell made the battery. Anyone knows who made it? Could not find a date on it, but saw a copyright date of 2014, which doesn’t say a lot. Any good replacement?