The Energy Drinks are for normal play, Battle drinks is for the PvP matches. So you can use an Energy Drink if you want to play even thought your energy is at zero (lightning bolt icon). You can use the Battle Drinks if you want to fight in the PvP Tournament (cage match) even if your Battle Points are at zero (crossed swords icon). There isn't a way to see how many you have, until you use one.
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