These batteries can be used to recharge the Stun Gun belonging to Alyssa.
Additionally, David can use this item to create a new weapon. If he has at least one strip of Vinyl Tape left, he can combine this battery with an Iron Pipe to create the Stun Rod.
Experimentation chamber - Umbrella research facility
Normal
On the floor against the northern wall of the area behind the laser beam wall. You can only access this area once the Tyrant has been released from the observation mezzanine.