_BIX is basically _BIF but with more information added, such as cycle count, measurement capacity accuracy and whatnot.
Starting with ACPI 4.0 _BIF is rendered obsolete and as a matter of fact a lot of modern hardware fill their ACPI machine data to _BIX.
ReactOS must go forward and beyond, compatibility with _BIF is kept. NOTE that a machine can ONLY support one battery static information method!
CORE-18969
CORE-19452