Is are there any really good boat or lawn mower?Batteries made anymore?

there might be , I haven't found them.

if you don't find them , store the one you do find in the house on a board , with a battery maintainer on it once a month , while you have them out of the mower or boat

For lawn Interstate is good. But remember, lead acid batteries are only good for about 4 years now a days. Including car batteries. According to my mechanic.

Mower batteries? I don't think so, seems all the reviews on the ones I looked at were poor, 1 year at best usually dies right after any warranty, As for boats, I use a deep discharge starting marine battery that holds up well. I think the last one was from Walmart. They are expensive though. My boat battery is hooked up in the boat year round with a 60 hp Honda outboard, I often work through the winter with it. The big thing I found with boat batteries is they tend to boil the water out of them faster than you'd think, exposing the plates which hastens the batteries failure, I top off the cells several times a year with distilled water.
Can't say for sealed batteries, I've never used them.

I just replaced the battery in my zero turn mower. It was 4 years old and had been dragging a little the last couple of years. I just bought another from Menards, $38 if I remember correctly. My flat bottom aluminum jet boat has a deep cycle cranking battery from Sam’s. I think it is Duracells if something like that. 3 years old and still strong.

I sold my bass boat last year that had blue top Optima trolling batteries that were 8 years old and would last all day on the lake.

I mostly buy Duracell batteries for all my stuff like lawn mower, ATV, boats, etc. I run battery savers on several of them. It seems to extend the life of the battery

There are so many good boat batteries out there it's impossible to even remember them all. You almost have to not look to ask the question.

I've found it depends on the charging system on whatever you put the battery in as much as how good the battery is.

I have such faith in the mower batteries I keep at least 1 new spare in the shop at all times. One thing get the 350cc power over the 240cc

Cold weather is hard on these batteries. Plus you don't run your mower in the wintertime like Uncle Jbyrd63.

I always wondered why a battery for a quad costs double what it costs for a riding mower battery. Most of the time, the mower battery is the larger of the two.

Battery tenders help to keep them working longer

Interstate

I take lawn tractor and boat battery out in the winter and put them in the cellar on a float charger. Have no problems both batteries were bought around the same time 6 or 7 years ago. These are lead acid batteries and whatever generic kind Walmart had at the time. Make sure you top off with distilled water when necessary.
My snowmobile and four wheeler were the battery eaters until I changed them over to gel batteries 3 years ago. I have had no problems and leave them in the machines year round. I do make sure I start them on a regular basis if I'm not riding

everstart from Walmart. They are mostly the same just Walmart is easier to get warranty
Boat and lawn mower....

Dakota Lithium. But they are spendy.

As above I take my several batteries and put them in the basement for the winter. I don't use or have a float type charger.

Bryce

I really miss the Sears Die Hard's !!!!!

Batteries are a crap shoot. One will last 10 years and the next will last 10 months. This was told to me by the guy who owns the battery store down the road. I've found this to be true.

As far as lanwmower/ATV batteries, I've had the best luck with the cheap Fleet Farm batteries personally. I've bought high end/Spendy batteries that didn't last a year. The cheapo from Fleet Farm for my ATV is close to 10 yrs old now. I have a cheapo in my Ice fishing flasher that's almost that old and it gets banged around a LOT.

I was also told that heat kills more batteries than the cold does. I'm not sure if I completely believe this but a week after someone told me that (on the hottest day of the summer) my car battery went belly up.

The last mower battery I bought was the better one not too long ago it has a 6 month warranty on it that says a lot.