Battery health increased with factory reset
I purchased my iPhone XS on November 2018 and I m using this device as my regular daily driver. It was when I reset all the settings and data’s few days back and I got the battery health at 98% but prior to this it was 97% which means a rise in 1% after the reset done. So my doubt or rather question is that is it normal to gain some percentages of battery health after the factory reset? Or is there was some software issues that showed one percent less prior to reset. Please note that the same thing happened to my iPhone 6s and that time it was nearly 4% of increment. Both the devices are running on iOS 12.3.1. Any idea please convey. Thanks.
iPhone XS, iOS 12