[ltp] Battery does not charge at all T400

cristian bono linux-thinkpad@linux-thinkpad.org
Sun, 13 Mar 2016 15:20:55 +0000

good information about batteries=20

> On Mar 13, 2016, at 9:29, "Paul Seelig" <pseelig@rumbero.es> wrote:
>> On 03/13/2016 07:28 AM, Toyam Cox wrote:
>> battery cycle count (as reported through the tp_smapi module) is 331
>> cycles. So the battery is in reasonable condition, and the thinkpad
>> itself is in good condition in all but caring the battery.
> I wouldn't call 331 cycles a death verdict yet, but it certainly is no
> indicator for a battery being still in reasonable condition either.
> I have had SANYO batteries with much less cycles die, while a Panasonic
> produced in 2006-08-07 is still providing slightly half of its former
> capacity of 84240 in spite of its 814 charge cycles. But only Panasonic
> are known to have such an incredible longevity (with SONY being worst).
>> I do not know why, but despite buing plugged in, while the computer is
>> on or off, the battry stays at 0$ charge. I cat
>> /sys/devices/platform/smapi/BAT0/state and get "idle" back .
> Does another battery charge fine on the same machine?
> Try with another Thinkpad of the same generation or also a widescreen
> 14.1" T61, in order to exclude your T400 from being the main culprit.
>> Yes, the battery is at 0%. I can unplug the laptop and watch the machine
>> instantly poweroff.
> When was the last time you ever used that battery? How many months did
> it sit unused before? Chances are it has simply died while being deep
> discharged during a too long period of not being used?
> I once acquired a nice 14.1" T60 in excellent condition for just a
> steal. The former owner forgot its power on password and just had it
> lying around unused for some unknown amount of years before he decided
> to give it away. When i finally received it, the Panasonic battery had
> just a dozen charge cycles, but was dead as a brick. I tried charging it
> continuously and uninterruptedly over a full week on a well known good
> machine, hoping to miracuously resuscitate it, but to no avail.
> Extended storage of laptop batteries without periodic charge control and
> refresh simply kills them. Batteries in general are consumables that
> eventually die after a more or less extended time of usage and simply
> need to be replaced if it happens.
> Hope you are still lucky, though.
> Regards,
> Paul
> --=20
> The linux-thinkpad mailing list home page is at:
> http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpad