Board Thread:Tips, Tricks, and Questions/@comment-112.208.110.0-20130715074729/@comment-21492862-20130920111724

Mhm, look.

If I had 5 energy and I bought 50 energy, I would have 55 energy. Once my energy is below 5 again, it is being raised by 1 every 10 minutes, like always. You won't get any energy by that timer if your energy is 5 or higher.