Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
Notice that when the battery is a primary battery (a non-rechargeable battery such as an Alkaline-
Manganese battery) and cannot provide accurate information about the battery to use in the
calculation of the remaining battery life, the Control Method Battery can report the percentage
directly to OS. It does so by reporting the Last Full Charged Capacity =100 and
BatteryPresentRate=0xFFFFFFFF. This means that Battery Remaining Capacity directly reports the
battery’s remaining capacity [%] as a value in the range 0 through 100 as follows:
Remaining Battery Percentage[%] =
Battery Remaining Capacity [=0 ~ 100]
Last Full Charged Capacity [=100]
* 100
Figure 10-62 Remaining Battery Percent Formula
Battery Remaining Capacity [mAh/mWh]
Remaining Battery Life [h] =
Battery Present Rate [=0xFFFFFFFF]
= unknown
10.2.2.7 _BTH (Battery Throttle Limit)
Figure 10-63 Remaining Battery Life Formula
This method will communicate to the platform firmware the thermal throttle limit set by on the
battery.
Arguments:
Arg0 – An integer from 0 to 100 containing the battery thermal throttle limit in percentage. At 100%,
the battery can be charged at maximum current.
Return Value:
None.
Note: Firmware is responsible for taking the current thermal throttle limit into account when engaging
charging.
578 April, 2015 Version 6.0