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  • HP battery "bootstrapping"

    From Nuno Silva@2:250/1 to All on Friday, November 08, 2024 11:47:51
    Hi,

    Sadly, I've got a HP pavilion dv2 laptop here that was left with the
    lithium battery almost empty for too long (maybe 2 to 4 weeks?), to the
    extent now it doesn't charge normally. The battery was operating
    normally before that, no signs of reduced capacity. The only thing
    leading to this seems to have been that it was left at 0% for too long.

    A HP battery test tool (Windows only, I wonder if I can get the same information under linux, maybe it's in the verbose output of the acpi utility?) reports that part of the time the voltage is increasing (still
    well below design voltage, around half of it), but sometimes it will
    also decrease. I suppose this means sometimes the battery is being
    charged, but not always.

    Does anyone have any idea of how do HP laptops implement the bootstrap charging process? Is there some secret handshake to initiate this in a
    way that goes on until the battery can be charged normally? Or are
    voltage drops part of the bootstrapping charge process too?

    The battery is removable and if I do that, it'll go back to slowly
    increasing voltage values, but this is still sub-optimal as it requires constant supervision, to avoid too much of a drop.

    --- MBSE BBS v1.1.0 (Linux-x86_64)
    * Origin: A noiseless patient Spider (2:250/1@fidonet)
  • From Bobbie Sellers@2:250/1 to All on Friday, November 08, 2024 19:31:09
    Reply-To: blissInSanFrancisco@mouse-potato.com

    On 11/8/24 03:47, Nuno Silva wrote:
    Hi,

    Sadly, I've got a HP pavilion dv2 laptop here that was left with the
    lithium battery almost empty for too long (maybe 2 to 4 weeks?), to the extent now it doesn't charge normally. The battery was operating
    normally before that, no signs of reduced capacity. The only thing
    leading to this seems to have been that it was left at 0% for too long.

    How old is the battery aka how long in use?



    A HP battery test tool (Windows only, I wonder if I can get the same information under linux, maybe it's in the verbose output of the acpi utility?) reports that part of the time the voltage is increasing (still well below design voltage, around half of it), but sometimes it will
    also decrease. I suppose this means sometimes the battery is being
    charged, but not always.

    In PCLinux you can get current battery information via the CLI of course but we have a battery widget on one of my panels that gives
    the current state and whether charging or discharging..

    Have you downloaded the manuals that should be available on the
    HP web site?



    Does anyone have any idea of how do HP laptops implement the bootstrap charging process? Is there some secret handshake to initiate this in a
    way that goes on until the battery can be charged normally? Or are
    voltage drops part of the bootstrapping charge process too?

    The battery is removable and if I do that, it'll go back to slowly increasing voltage values, but this is still sub-optimal as it requires constant supervision, to avoid too much of a drop.

    Might be best to buy a new battery. Of course I did that with
    my Dell Latitude 7450 and I bought two and one was bad so good luck.

    bliss


    --- MBSE BBS v1.1.0 (Linux-x86_64)
    * Origin: nil (2:250/1@fidonet)