Date: Tue, 25 Sep 2012 19:59:51 -0400 From: Brandon Allbery <allbery.b@gmail.com> To: Michael Schuh <michael.schuh@gmail.com> Cc: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: Re: battery state - hw.acpi.battery.life goes only down Message-ID: <CAKFCL4UHVOcaq-9wU2ePbEU=K4gtck%2B8Ro2AEf6nT8D8QJc%2BNQ@mail.gmail.com> In-Reply-To: <CADwRVEYhb4BqkuOu2rgOLpHBbmm4UaAhsLjLLurMuRs4giL-0A@mail.gmail.com> References: <CADwRVEYhb4BqkuOu2rgOLpHBbmm4UaAhsLjLLurMuRs4giL-0A@mail.gmail.com>
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On Tue, Sep 25, 2012 at 7:43 PM, Michael Schuh <michael.schuh@gmail.com>wrote: > this wrong number seems persistent during a reboot. > i tested this, shortly. > the battery life after reboot was 97% with power supply plugged in all the > times. > > after a clean boot the system camed up with a battery.life of 97% ( power > supply plugged in :O ). > Sounds like normal lithium ion charger behavior to me; typically they won't kick in the charger until it reaches somewhere between 90-95% (depends on the device). This extends the useful life of the battery; raw lithium ion is just as (actually, more) prone to destruction via overcharging as other battery technologies. http://batteryuniversity.com/learn/article/charging_lithium_ion_batteriesdiscusses this. Note in particular: "A continuous trickle charge would cause plating of metallic lithium, and this could compromise safety." -- brandon s allbery allbery.b@gmail.com wandering unix systems administrator (available) (412) 475-9364 vm/sms
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