Program A battery

I remember my battery in my trusty old tank-like Program A packing in. The guy in the shop replaced my one large micro cell with two smaller ones. Camera didn't seem to work properly after that so I chucked them out and bought an MZ-5 (as you do). Obviously now I want my Program A back. Can anyone tell me what battery(s) I need please?

Two SG13 silver oxide cells, also known as SR44 I think. They are not expensive, and should be readily available.

Wow, thanks John, that was QUICK!! One bid and £2.35 later, they're on their way to me. Thanks a lot