Enable Windows battery time on hover
Battery time remaining estimates for computing devices can vary widely in accuracy. The estimates are based on assumptions about future behavior based on prior usage trends, from a mix of current and prior charge usage. Windows updates can disable battery time remaining, and devices may come from the factory with battery time estimates disabled.
Hovering over the battery icon on the Windows taskbar can show the estimated battery time remaining along with the percent battery charge. The estimated battery time remaining is the same shown under System / Power & Battery.
The usual precautions on modifying the Windows Registry apply–do a Windows System Recovery milestone first. These keys are under:
HKLM\SYSTEM\CurrentControlSet\Control\PowerReboot after making these changes. It may take a minute or two after first reboot for the estaimted battery life to show up.
If these registry keys exist, set their value to 0. If they don’t exist, that’s fine too.
EnergyEstimationDisabled=0
UserBatteryDischargeEstimator=0Create this DWORD32 value (if not existing) and set to 1
EnergyEstimationEnabled=1Reference: forum