[X4U] Laptop battery life?

[Tom Renaud]

It only shows a full cycle after being discharged 100% and  
recharged.  If you only use it down 25% and then charge, it's only  
25% of a cycle, so it takes 4 to make a fully cycle.

Here are the stats on my MacBook Pro, I've had it for about 13  
months, I leave it plugged in most of the time, and the battery still  
has good life to it.

  Battery Installed:	Yes
   First low level warning:	No
   Full Charge Capacity (mAh):	5188
   Remaining Capacity (mAh):	5059
   Amperage (mA):	-23
   Voltage (mV):	12370
   Cycle Count:	45

--
Tom Renaud

Technology Coordinator
Twin Cedars Community School
Bussey, Iowa
http://www.twincedars.k12.ia.us


On Nov 18, 2007, at 10:11 AM, Stroller wrote:

>
> On 17 Nov 2007, at 19:46, Stroller wrote:
>> ...
>> The short story is that after I expressed my dissatisfaction the  
>> support agent at Apple agreed to give me a new battery "as a  
>> courtesy". Based on a "full charge capacity (mAh)" of 4105 in  
>> System Profiler they reckoned the battery to be 80% as good as  
>> new, but that just doesn't jibe with the number of hours I seem to  
>> be getting out of it - unless I'm misunderestimating quite badly,  
>> I'm getting about half the battery life I originally did.
>>
>> Part of the reason that Apple agreed to this replacement was that  
>> they started out by saying that one should only expect 300 charge  
>> cycles out of a battery and that mine has 302 (again, shown in  
>> System Profiler). ...
>
> FWIW this is what my mother's identical MacBook shows:
>
> Battery Information:
>
>   Battery Installed:	Yes
>   First low level warning:	No
>   Full Charge Capacity (mAh):	5439
>   Remaining Capacity (mAh):	5358
>   Amperage (mA):	-45
>   Voltage (mV):	12438
>   Cycle Count:	38
>
> It would appear to be in MUCH better condition than mine - perhaps  
> surprisingly so, as I didn't think I mistreated mine so badly. Hers  
> is also a CoreDuo (not Core2) and is probably 6 months newer than  
> mine - perhaps a year old. I'm surprised to find that it shows so  
> few cycles - this must indicate a COMPLETE discharge & recharge; I  
> think my mother's normal usage is to leave the laptop unplugged  
> when in normal use and plug it in when she's finished; she probably  
> uses it typically for 30 - 60 minutes at a time.
>
> Stroller.
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