Arguably this is more relevant to the 787 grounding issue than specifically to the batteries and chargers issue, but I noticed on FlightAware several reported flights reported as 787 flights operating under the ID BOE5 out of San Bernardino International in the last few days.
The FlightAware link for BOE5 is:
Boeing #5 Flight Tracker ? FlightAware
While I've seen seeing a small number of apparently spurious taggings of flights as 787 flights for weeks (mostly presumably false data-entry on ANA Frankfurt-Haneda operations) these KSBD flights seem plausible.
In BOE5 flights listed as of the moment of my posting, there appears to have been a positioning flight from Boeing Field to San Bernardino on April 13, with subsequent daily or more flights out over the ocean in a generally SSW direction. The tracking data seem erratic, possibly partly because of the over-ocean positions.
My guess is that these are real 787 flights. Does anyone know more?