I see that regeneration is like an energy pool, where you get power from a limited source to regenerate your or someone else's body.
But, is the limit the same for all Time lords/ladies? Is there a way to recover this power somehow?
Although regeneration usually appears as an involuntary, biological process that occurs when death would otherwise be imminent, the nature of regeneration has not always been consistently represented. It has been most fully explored over the years in the case of the Master:
However in all of these cases, the question of "how would that work, exactly?" is never answered.
While regeneration is commonly something that happens when death might be expected, it doesn't have to be this way:
Romana's regeneration also suggests pretty strongly that the regeneration limit is not a major concern, since otherwise the repeated regenerations would be nearly suicidal. Whether this is because she thinks she can reset the count, or because the limit doesn't apply to her, or for some other reason is not stated.
From past evidence it therefore appears that:
There is quite some information on this (mostly from the old series) if you google it so I won't give a full explanation but only my own interpretation. The regeneration process is a natural ability of the Time Lord race to regenerate completely when mortally wounded. Once the process starts, the cells of the Time Lord produce energy that can completely transform the body of the Time Lord. The energy production cannot be stopped but the tenth Doctor is shown to be able to guide it somewhat as he heals himself and direct the surplus of energy to his severed hand.
During the series, the limit of 13 incarnations of a single Time Lord is mentioned but this limit should not be taken so strictly. There are several episodes in which exceptions to this limit have been shown (the most recent being the regeneration of the Master). As far as I know, there have been no elaborate examples as to what would happen if a Time Lord were to regenerate over the limit. This could be a simple rule in their society (to avoid overpopulation) or really be a biological limit (cell deterioration after too many regenerations) but this is speculation. As the Doctor is nearing the limit, I believe that we will see more on this rule in the following season(s).
There is quite some information on this (mostly from the old series) if you google it
is kind OFF that idea, no? specially the part "if you google it"...