My battery decided to kick the bucket this morning. Thank goodness at home! Anyway, I went to the local battery experts with the 40B19R battery my Acty had. They came back with a NEPO M44 (see pic). Never heard of the brand before. But it fit great. Same terminal size and location. It's SLIGHTLY taller-the hold down bracket easily accommodated the slight height increase. It was $100 and change. Yes, a lot more than the lawnmower battery options I saw online. But, apologies to those who've successfully used them AND due to my personal past experience in actual riding mowers, lawnmower batteries NEVER seem to last as long as automotive. Turns over a LOT faster now!