Suddenly my energy fell down of 4k to 116, and that's my top level of energy. I'll be waiting to overpass 116 all day but when the energy reach 116 appears a message saying "full".
Hi, max energy sets the cap on how much energy you can regen. You can only go over the capped number by opening refills/obtaining energy from ways other than the normal energy regeneration (leveling up, event rewards, purchasing, etc.).