To help you better track how much Stock you have available at each Battery or quickly find out which Tanks are ready to be called in, simply run the Battery Stock Capacity report.

Not only will the report give you a summary of all tank sizes at every Battery, but it will also show you total capacity available, total capacity used, and the % full of every tank.

Also, if you'd like to glance at the stock status of any given Battery, simply go to Batteries (on left hand side bar) > Select Battery > then under 'Overview' tab along top bar, select 'Capacity':