I have been searching of any post people changing their Battery from their Portable Battery Booster packs. I have been using my it for for sometime in the winter to help jumpstart my car. But I made sure to charge it when its close to midpoint. But as I use it, it seems to drain pretty quickly. I have been using it for USB, Filling air in the tires, light,etc. So anyone ever changed their battery of their battery booster pack. Mine is about 4 years old. The new models have easy access to swap batteries pretty easily. But mine is something I bought from Advance auto parts. Thanks