[ltp] poll: how is your battery? (9-cell-battery lost about 25% capacity in 10 months)

[Damian Lubosch]

Fionn Behrens wrote:

>My T42p's 9-cell battery with an advertised capacity of 72Wh started out
>at 71,6 on the first day. I didnt mind very much until some 2 months
>later a new unit for a colleague arrived and had more than 73Wh.
>
>  
>

Mine Laptops battery is a R40 Battery with design capacity of 57,6 Wh
and now after 2 years it still has 45Wh (78% of design) which powers the
laptop for about 4,5h (new 6h) in Windows and 3h (new 3.5h) in Linux.
There were about 140 charge cycles. I never let it drop below 3% of
capacity and when I am not using it, I discharge it to 70-80%. That's
the trick ;-)

>Now my battery has gone well below 60Wh although it was only moderately
>used and I even kept it out of the notebook in a cool place for extended
>periods as recommended for LiIon cells.
>
>  
>

Have you stored it fully charged?

>If this was an el-cheapo notebook I might not be surprised but I think a
>high-end unit with a sales price of well over 3000 Euros should not
>suffer such a capacity loss in that short a time.
>Additionally the notebook battery of my colleague shows a much less
>steep "degradation curve".
>  
>

Yes, see mine...

>I called IBM service and they told me they would only change the battery
>if some ominous "battery health monitor" in windows says the battery is
>bad. Too bad I sold my windows license already and kicked the shit off
>the harddrive.
>  
>

Such a pity. I (un)fortunately need my Windows for work

>Since IBM started to sell T42p's without windows recently I wonder what
>those customers are up to if their batteries fail ;-)
>
>What would you say, is a loss of 25%-30% in 10 months really acceptable
>for a quality battery? What are your own experiences?
>
>  
>

How long does it last in use?

>sunny summer greetings,
>			Fionn
>  
>
Bye, Damian.