whoops.
A 25% refill. Plus the shield regen skills. Neither are particularly useful. I wouldn't mind not having a health heal if it were easier to maintain shields and energy without items and any damage to my hp would be my fault.
This is somewhat off topic on my part, but the more I consider it the more I become convinced that the tech was originally designed to be dependent on cybernetic implants. A little bit of boosterware seems like it would perfectly fill the gap in the tech's abilities.
Edit: As far as high HP enemies, they're usually better combatted with lust attacks regardless of character class.