If your notebook has dead batteries — perhaps no longer commercially available — or a failure on the charging circuit, this notebook power bank project might be for you. It is a backup power supply system that enables you to keep the work session open on your PC for short periods, when you move it from one room to another, or keep it on standby for hours, without reconnecting it to the mains.

A Special Need

As it often happens, many new projects come from a special need. Since the last two years, my wife’s PC has been working without the battery, and it was always powered by an external power supply. Of course, I tried to replace the battery at first, but the problem was still there. The defect was coming from the motherboard and not easy to repair. So, I proposed to her to design an external power supply, with embedded batteries, which could allow her to move with the computer without losing her working session.

The Original Design

The first design was assembled with so...