Photon charge

Not pictured: Galvatron's arm

Photon charges are a type of small bomb which pack a powerful wallop.

Fiction

The Transformers cartoon

Hot Rod lamented that the Quintessons had more Sharkticons than he and Kup had photon charges. The Transformers: The Movie

Scourge had a photon charge with him when he stole Metroplex's eyes. He left the charge in Metroplex's head, with a countdown starting at one minute, to cover his escape. As he rocketed off, the charge exploded, bringing down Metroplex. Ghost in the Machine