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HP battery "bootstrapping"

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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.

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HP battery "bootstrapping" Nuno Silva <nuno.silva@invalid.invalid> - 2024-11-08 11:47 +0000
  Re: HP battery "bootstrapping" Bobbie Sellers <bliss-sf4ever@dslextreme.com> - 2024-11-08 11:31 -0800
  Re: HP battery "bootstrapping" Sanjay Anoop Nair <sanjayanoop010707@gmail.com> - 2025-05-14 16:50 +0530

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