You're talking nonsense! Whatever the battery is, after two years it loses its properties.
Nothing like the truth
we made electric fork lift batteries that were good for 20+ years
Yes after 5 or so years the storage capacity started to drop off but 20 year down the track they still had 20 hours of run time per charge
Now on a fork lift, having a 3 ton battery is an advantage because it also doubles as a counter weight
Not quite the same as on a riding mower.
Spiral cell Pb batteries can power most smaller E things quite well .
I use them to replace the deep cells used in golf carts & they work a treat .
It is all about available surface area & spiral cell battery have massive pate surface areas .