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Posted by tc on January 25, 2008, 1:45 pm
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> Andy Fish wrote:
>> my point was that if i take the battery out when i'm on the mains (which
>> seems to be the best way to prolong battery life) then the laptop will
>> crash if there is a mains power glitch
>>
>>> Power glitches won't hurt the battery.
>>> Terry
>>>
>>>> Thanks Dave for a very comprehensive and considered reply. I was
>>>> assuming that, since laptop makers have a vested interest in the
>>>> battery degrading, they might have chosen not to implement the best
>>>> solution
>>>>
>>>> i'm left with the conclusion that the only way to keep my battery in
>>>> tip top condition if i'm using the mains most of the time is to take it
>>>> out every time i'm not using it and leave it in the fridge at 40
>>>> percent charged :-)
>>>>
>>>> the reason i don't want to take it out is (a) simply hassle, and (b)
>>>> protection from power glitches (though these are very rare)
>>>>
>>>> Andy
>>>>
>>>>>
>>>>> >from what I can tell, it's a bad idea to run it on the mains all the
>>>>> >time
>>>>>> unless the battery is removed (which I don't want to get into). so
>>>>>> therefore
>>>>>> I could presumably maximise the battery life when i'm in the office
>>>>>> by
>>>>>> running it on batteries for a while, then turning on the mains power
>>>>>> until
>>>>>> it charges up to nearly 100%, then using it on batteries until it
>>>>>> gets low
>>>>>> again and so on.
>>>>>> is this true? anyone tried it?
>>>>> No, that's a really bad idea. It will shorten the battery life even
>>>>> more.
>>>>> LiIon batteries are good for a few hundred charge/discharge cycles
>>>>> total, and you're going to be using up one of those cycles every few
>>>>> hours of operation.
>>>>>
>>>>> Basically, you'll get the best life from a LiIon battery by using it
>>>>> only when you need battery operation (to minimize charge/discharge
>>>>> cycles), removing it from the laptop when you're using the laptop on
>>>>> AC
>>>>> (unless the battery needs charging) to avoid exposing it to higher
>>>>> than
>>>>> room temperatures, and leaving it partially charged (instead of 100%
>>>>> charged) if you store it for long periods.
>>>>>
>>>>> If you're not willing to install and remove the battery when you
>>>>> switch from portable to AC operation, your second best choice is just
>>>>> leave the battery in all the time, and use AC power whenever that is
>>>>> available. This will shorten battery life somewhat compared to the
>>>>> ideal case.
>>>>>
>>>>> But what you suggest, charging and discharging the battery repeatedly,
>>>>> is likely to give *shorter yet* life by simply exhausting the
>>>>> battery's
>>>>> charge/discharge life. Also, while charging or discharging it gets
>>>>> *even
>>>>> warmer* than just sitting in the laptop without charging.
>>>>>
>>>>>> if this idea really works, presumably it would be possible to write a
>>>>>> piece
>>>>>> of software which worked a bit like a thermostat enabling and
>>>>>> disabling the
>>>>>> mains input to keep the battery charge always between (say) 70 and
>>>>>> 90%.
>>>>> Really bad idea. You're proposing to avoid something moderately bad
>>>>> by
>>>>> doing something that's even worse.
>>>>>
>>>>> Why don't you want to remove the battery when operating from AC, other
>>>>> than the inconvenience?
>>>>>
>>>>> Dave
>>>>>
>>>>>
>>>>> Dave
>>>>
>>>
>>
>>
> that's of course what I understood ... Hence, my previous post!
>
> Regards
>
> --
> John Doue
Sorry , I got lost in the thread direction. The usual suggestion is to use a
cheap UPS to handle those situations.
Terry
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