After a session of full concentration, I usually like to take a 5-10min break, usually take a coffee break, or go for a quick stroll around the office. I find that this allows my "batteries to be recharged" for the next session, but sometimes it does not get back to the same level as before. I do not expect it to until I get a full session of rest (sleep).
What can I do in the 5-10min break that will maximise the recharging of my batteries?