Near the end of the video, during the Q&A, he talks about this problem and says they have a solution that is based on the halogen cycle. Here is a link to a site that talks about how this keeps a halogen bulb's filament from burning out too quickly.
Thanks Robert, such kindness is becoming increasingly rare in these parts.
If the process that produces overunity power production in the SunCell is LENR instead of hydrino, a buildup of transmuted element of many kinds will accumulate over time.
If LENR is the source of overunity, I will be interested in the problems that this transmutation interference in the chemistry inside the SunCell causes for Mills, and I wonder if Mills will admit to such problems if it does in fact exist?