Mac Book Pro 17" battery life?

[K9 Kai Niggemann]

Hey Martin,

 thanks for the electricity 101, I guess I need to brush up on that..;-)

And just to make sure, Andrew: is yours a MacBook Pro 17"? and a model MacBookPro8,3?

Kai





On 06.09.2012, at 08:52, Martin Naef wrote:

> On 05.09.2012 22:58, Andrew Tarpinian wrote:
>> On Sep 2, 2012, at 10:44 AM, K9 Kai Niggemann <canine at waf80.de
> 
>>> Wow yours looks way better than mine:
>>> 
>>>  Fully Charged:Yes
>>>  Charging:No
>>>  Full Charge Capacity (mAh):8307
>>>  Voltage (mV):12461
> 
>> maybe, mine is 3 years old and looks like this:
>> 
>>   Charge Information:
>>   Fully Charged:No
>>   Charging:Yes
>>   Full Charge Capacity (mAh):11730
>>   Voltage (mV):8363
> 
> I don't know much about the MacBooks, but from these two figures I doubt it's the same battery type, hence the comparison doesn't tell much.
> 
> 12.6V is a typical end of charge voltage for a 3 cell LiPo type battery, whereas 8.4V is typical for a 2 cell. Obviously, the 2 cell type needs a higher capacity (as measured in Ah) to provide the same amount of juice.
> 
> So doing a quick math with rounded figures and ignoring the voltage drop during discharge, you get about 103Wh on the first battery, and 98Wh on the second. That's a negligible difference and easily reverted depending on the discharge voltage curve.
> 
> Martin
> 
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