Nerf the robustec

[Triacontakai]

Alternatively, make them run off the user's stamina, in much the same way as the internal battery idea, as if it's drawing power from you to power itself. Comes with a built-in tradeoff in that taking constant minor damage will drain stamina and eventually cause you to just run out.

i think this is a really good idea
makes for an interesting mechanic where the omnizine makes you harder to kill, but you may also be unconscious for longer because of stamina loss from someone beating you, with the implant taking the stamina to recharge