Originally Posted by IonDragonX
Yes it does mana charge by 3 every time you spend your mana. You can just sit in base and cry away.
However, there is a 3 second cooldown for each charge with a capacitance of 3. This means you can instantly build 3 charges (+3 +3 +3), then you have to wait until one expires (tic tic tic) to make another charge.(+3) So then you have to wait until another one expires and so on and so forth.
Do you want to sit in base for 744 seconds to fully charge? That's over 12 minutes.
Anyway that the way it is supposed to work. Looking through some other threads, there seems to be some debate over whether or not the item is bugged. It could be that, right now, the charges all expire when 3 seconds is up. If that is the case, you charge (+3 +3 +3), then you wait till they all expire (tic tic tic) then start all over again.
If it really is bugged that way, then you can finish in 250 seconds or so. That's over 4 minutes but still too fast.