Perhaps you could wait a year and buy another one unless you need two of them right away. Why use one battery and let the other one sit and lose cell life?
I use the iGo Juice adapter to keep my battery charged wherever I am. So I only spent $60 instead of $200-$300 for another battery.
Jiggy is out in the boonies, so he needs like 3 batteries…...or a solar paneled baseball cap.