Plan on replacing th battery every 2 years or so. Some last up to 5 years but most don't.
I found if you change the electrolyte ( even in maintenance free Batts.) when the battery starts to show signs of slowing down you can get "like new" performance again, and extend the life. A one gallon box of electrolyte is about 8 bucks, and will out last the scooter.
The electrolyte in the battery doesn't really break down but it does evaporate over time. Even in maintenance free batteries.
Just for good measure... Wives Tale: Putting a battery on concrete drains it. Not true!
Batteries are Temperature Sensitive, and concrete pulls heat away from the battery. It will read less CCA on concrete but pick it up/ Temp. rises, and CCA are back to normal.