I bought some in Lowe's recently. They were located by the solar lights.
any rechargable battery can be used. These are readily available in Hardware and Supermarket Stores.
I bought some a Walmart
Amazon for sure if you don't want to go store to store. Lowes, Walmart, Home Depot are all good sources THIS time of year... after spring/summer,... not so much. Good luck! Let us know where and how much when you get some.
If you are talking about an AA battery in the landscape lights, those batteries are typically rechargeable so it would be best to buy a battery charger.
@Dottie you need to look for rechargable batteries. They won't say solar batteries. I bought mine at Walmart. They will recharge from the sun, so don't really need the charger. Mine work that way.
Ace Hardware is the place and yes. Rechargable is the word.