[ltp] T4x Battery Conditons Survey

[Michael Gaber]

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Eric Van Buggenhaut wrote:
> On Sat, Dec 17, 2005 at 01:58:55PM +0000, Peter B. West wrote:
>> Eric Van Buggenhaut wrote:
>>> On Fri, Dec 16, 2005 at 03:53:03PM +0800, Kelvin KAN wrote:
>>>
>>>> Now nearly 1 yr, in 38 charging cycles, the battery capacity of my T42 
>>>> has dropped from 4700mAh (designed) to 4200mAh (fully charged).   
>>>> Projecting this degradation into next yr, it will be practically giving 
>>>> me only 2-hr running by next X'mas.
>>>>
>>>> To be honest, I've been using the battery with great care and have 
>>>> removed the battery while running on AC.  And 38 charge cycles in 1 yr 
>>>> does NOT seem too frequent.
>>>>
>>>> How's yours?  Really an IBM (not Lenovo) quality issue?
>>>
>>> Same problem here. When I bought my T42 they claimed the battery to 
>>> stand 5h. I never went beyond 3h (which is normal: 47000mAh/16000mW = 
>>> ~3).
>>>
>>> After one year of intensive use (200 charges) always emptying the 
>>> battery before charging, I get a max. capacity of 42000mAh just like 
>>> you. I'm kind of disappointed by this aspect of the Thinkpads, 
>>> probably the only weak point of this laptop.
>> This sounds like great battery performance to me.  If this is typical of 
>> ThinkPad batteries, we have nothing to complain about.  Try a Dell sometime.
> 
> Well, after loading smapi, I can give much more precise data:
> 
> atto:~[0]# cat /sys/devices/platform/smapi/BAT0/design_capacity
> 47520 mWh
> atto:~[0]# cat /sys/devices/platform/smapi/BAT0/cycle_count
> 266
> atto:~[0]# cat /sys/devices/platform/smapi/BAT0/remaining_capacity
> 29970 mWh
> 
> After a complete charge. So I lost 30% in one year, much more than 
> what I thought first
> 

try cat'ing last_full_capacity, thats the better point to look than the 
remaining capacity

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