Working, battle hits and energy training hits each spend 50 energy; the amount needed and your current energy are shown before you act. Energy is capped at 100 and is one pool: energy spent in a factory is gone for battles too.

Energy refills on its own every 5 minutes, offline too. The amount depends on the hospital index of your current region: index 1–5 gives 2, 6–7 gives 2 and 3 in turn, 8–10 gives 3 and 11 gives 4 energy. A region without a hospital counts as 1; while travelling, your departure region applies.

5 energy drinks cost 1 GEMS; 1 drink refills 1 energy. A refill spends drinks for up to 50 energy for every 5 minutes since your last refill and refills partially when stock runs short. GEMS is charged from the selected profile’s wallet and the drinks go to the same profile’s stock. Drinks and GEMS cannot be sent to other players; drinks are not shared even between profiles on the same account.

Work has no separate cooldown. The free hourly battle and training hits neither spend nor produce energy; an energy training hit spends 50 energy like a battle hit.