This is normal Sigelei won't allow to much stress on the batteries sometimes mine will start saying check battery at %70 on some of my older batteries it's a good thing your Sigelei is protecting the longevity of your batteries life span stock up on batteries always use married batteries same brand bought at same time used always together never apart I labeled mine 1-10 that way always in order 1 goes with 2, 3 goes with 4 and so on it helps if they are the same age and share the same stress otherwise 1 is working harder then the other then before you know it both are bad