Hello, thank you for the question. The item takes a AG13 button battery. This is also the same as a LR44 battery which is readily from supermarkets, Screwfix and online retailers such as Amazon. The Screwfix code is 2910K. Please note the batteries are held in a white sleeve which needs to be retained when replacing the batteries. Many Thanks, Hilka Tools
Answered by: Hilka Product Expert
Date published: 2021-04-12