I labeled all my Neo batteries. To balance their use I installed an app called Stock and Inventory Simple. With that app I created inventory items for each battery. As I charge each one I add one to inventory count:

I know the Fly app gives you a battery cycle count but, the battery has to be in the Neo to get that. With my method I know what order to select batteries.

I know the Fly app gives you a battery cycle count but, the battery has to be in the Neo to get that. With my method I know what order to select batteries.