Nargott
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There are no endless battles. The first aid tent restores a fixed amount of HP - 100 units (without additional bonuses in the form of specializations, etc.). In the early stages of the game, this might be too much, but you still need to acquire the appropriate perk. However, in a longer game, the efficiency of healing is quite low, and the tent mostly serves as a dispel. After 3 uses, the tent turns into a decorative element and negates all the benefits of upgrading the machinery and the perk for the tent, as well as all hero specializations based on it. That's why I always preferred to avoid these skills and, when leveling up, choose almost anything except "the foundation of machine control."
I suggested using scripts to restore a percentage of losses after a battle, precisely with the expectation of a long game, but so that the player doesn't have to struggle with this tent for 100 rounds (and doesn't make the opponent wait all that time).
In that case, the damage from the ability will be reduced. If I remember correctly, the damage scales with the distance to the target.