Battery replacement?

What I have see with the latest firmware is that the battery meter seems to go down much faster then with earlier firmware… I confirmed this by downgrading the firmware long enough to confirm this…  With the latest firmware if the battery meter is down to 1/4 or a little less (still green) and I look under setting I have 49% battery left…  This is not a big deal but for some users one may think that there battery is getting weak do to use or age, when it’s really not! George