The personal Force reservoir describes the extent to which a Force user could utilize their Force abilities before experiencing exhaustion or other impairments. A user's capacity could be recovered through sleep and meditation. The amount of stamina a user possessed depended greatly on their level of experience. As an illustration, a Jedi Master could employ their abilities more frequently than a Padawan before becoming tired.
Depending on the Force user, various Force abilities placed different demands on focus and stamina. The repeated or excessive application of these abilities could lead to "Force fatigue," accompanied by a range of undesirable symptoms, both physical and mental. The quantity of Midi-chlorians a being possessed may have influenced the size of their reservoir. Nevertheless, even an individual with considerable Force potential could have their Force abilities negated by a more skilled opponent, or even be overcome by someone employing superior tactics, as exemplified by Darth Vader's defeat by Obi-Wan on Mustafar after failing to subdue him with a Force Push.
Count Dooku underwent fluctuations in his Force strength during the duel aboard the Invisible Hand. In this instance, Dooku's over-dependence on the dark side resulted in "Force exhaustion," which temporarily disabled his innate Force senses. In several cases, this exhaustion appeared to be strongly associated with Dooku's mental state, with his strength being restored through brief moments of self-reflection.
Darth Caedus's extensive use of the battle meditation Force technique during the Second Battle of Fondor left him "thin-stretched," rendering him unable to move or think clearly for a period, thus highlighting the limitations of Force usage. It was highly probable that these constraints were primarily related to mental restrictions and the body's inability to endure the continuous application of external energies. By entering a state of Oneness, a Force User could briefly tap into and unleash a level of power significantly beyond their normal capabilities, but this state was exceptionally difficult to attain and typically devastated the body, as excessive Light or Dark energy resulted in cellular death.
Corran Horn, a Corellian Jedi apprentice, made reference to his personal Force reservoir while undergoing training at the Jedi Praxeum.
The concept of a Force repository is present in Lucasarts games and functions as a gameplay element. As Force powers are employed, this resource diminishes and gradually refills over time or with rest. Its function in games is to replicate the inherent constraints (such as exhaustion, focus, and experience) of a user, while its gameplay purpose mirrors the 'mana pool' found in fantasy games; these systems prevent players from constantly using all of their powers, encouraging them to strategically select the optimal moment for each action instead of using them without thought.
Within the broader universe, it is not frequently explicitly stated that Jedi possess a limited (though renewable) supply of powers--and individuals can replenish depleted energy through rest and meditation.
However, the precise workings of these limitations remain unclear and are almost certainly not as mathematically precise as the 'Force mana' depicted in video games.
In the majority of games, the Force repository replenishes itself with time and rest. In certain games, such as the Super Star Wars trilogy for Super Nintendo, and Star Wars: Episode I Obi-Wan's Adventures, the Force repository is only restored by acquiring a bonus item located within the game environment (a potion-like bonus in the former).
In the non-canonical Soulcalibur IV, the Force ability of the three Star Wars characters is termed the Force Meter.