From owner-freebsd-acpi@FreeBSD.ORG  Thu Feb 12 16:27:18 2015
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Date: Fri, 13 Feb 2015 03:27:14 +1100 (EST)
From: Ian Smith <smithi@nimnet.asn.au>
To: george ember <sk8harddiefast@gmail.com>
Subject: Re: Laptop Battery drains insanely Fast!
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On Thu, 12 Feb 2015 17:55:56 +0200, george ember wrote:

 > Also I don't know if helps
 > *$ sysctl hw.acpi.battery*
 > hw.acpi.battery.life: 22
 > hw.acpi.battery.time: 53
 > hw.acpi.battery.state: 1
 > hw.acpi.battery.units: 1
 > hw.acpi.battery.info_expire: 5

 > I guess that means 53 minutes already working / 22% power left on
 > battery. Sounds bad :(

smithi@x200:~ % sysctl -d hw.acpi.battery
hw.acpi.battery: battery status and info
hw.acpi.battery.life: percent capacity remaining
hw.acpi.battery.time: remaining time in minutes
hw.acpi.battery.state: current status flags
hw.acpi.battery.units: number of batteries
hw.acpi.battery.info_expire: time in seconds until info is refreshed

53 minutes remaining at 22% still works out to ~4 hours total, assuming 
it shows 100% when fully charged, after having been fully discharged.

cheers, Ian