Photos of the fragments included a battery made by Tenergy, a specialty brand typically used in radio-controlled cars .
“It’s twisted because it’s a battery we built for a toy; to have it used this way is appalling,” said Benjamin Mull, an executive with the California company. “Not in a million years would I have imagined.”
Jim O’Sullivan of the Globe staff and Globe correspondents Haven Orecchio-Egresitz and Jeremy C. Fox contributed to this report. Mark Arsenault can be reached at firstname.lastname@example.org. Follow him on Twitter @bostonglobemark.