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I am in Northeast Connecticut. Last winter we had only a few very light snows. Not enough to bring out my 1964 Chief 1000 with it's 2 stage snow blower. So, in April when I decided to move it out to the shed for the summer, the battery was completely dead. I checked it with a hygrometer and each section stayed in the red. The hygrometer float didn't move even a mm in any of the 6 sections. So I tried something. I purchased a "battery rejuvinator" on eBay for $11. It was 6 small packets of a white powder. I poured into each into of the 6 battery sections and charged it up. I then started the tractor up and moved it to the shed for the summer. Today I decided to move the tractor to the garage for the winter. I turned the start key and it had almost enough power to start the engine. I then charged it for 5 minutes nan then tried again to start the tractor engine. It turned over quickly and started right up. So what ever the chemical was, it worked. A new battery would have cost me $50 and I was able to extend it's life for only $11.? ??

Thanks for the info, good to know, always thought those were scams.
I got tired of replacing fairly new mower batteries that went dead in the off season and invested in battery tenders (trickle chargers). They work great and have extended the life of all 4 of my mower batteries. I know one of the batteries is stamped 2017. On my mowers that aren't near an elec outlet, I remove the batteries and keep them on a tender in the garage. I believe they make solar chargers too.