Small Battery for PCB board?

Question

I am looking for a very small 5V DC battery to use on a PCB board to power a circuit consisting of buzzer and LED.

Anyone can recommend me what type of battery to use?

Answer 1

A 5V battery is going to be darn hard to find as the math doesn't work. You can get 6V in a small package by using 2 3V watch type batteries and your LED and buzzer should work ok. The bigger problem is in finding a battery(s) with a high enough mili-amp hour rating to give you much battery life in a small (thin) enough size for your project. The LED will work on 3V and the buzzer may too. No idea why you want to use 5V in the first place.