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It has a secondary effect other then charging your cores. For some reason when the core charge activates, it heals you as well. It was very nice for the daily op with robots as they had a lot of energy attacks and made elder rank easy.

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about 4 years ago - /u/Valseek - Direct link

Just want to clarify that the healing effect is intended as others have mentioned, but only while you are wearing PA. If you're not wearing Power Armor and it's still healing you, that would be a bug we would want to address. Thanks!