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Subject Topic: Using a 90W laptop with a 20Ah powerpack?
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Personbrashquido
14/7/2008 at 7:37am
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Hi All,

I'm on the road and needed a way to keep charge to my 90W Dell XPS M1330 laptop. I ended getting purchasing a 20Ah powerpack from Halfords, however it seems to be draining very, very fast to the point of being pretty much useless when charging my laptop from it.

Should I be getting better performance from a 20Ah powerpack, or do I need to get something with considerably more capacity?


PersonSam Coleridge
14/7/2008 at 8:22am
 Location: Somerset
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Standard laptop Liion battery is quoted as 14.8V 56WHr

Are you using a 240 volt invertor, or a 12 volt to laptop DC convertor ?

12 volts 20 AH = 240 watt hours

It sounds OK, but I never used to get anything like the full whack from the 12 volt 7AH lead acid I used to use for my 40 watts of bike lights.

I eventually switched to more efficient lights and a 3.3AH NiMH battery.


Personhappybonzo
14/7/2008 at 8:30am
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Why not just get a Cig lighter adapter from Maplin? Got to be easier


PersonPaulDG
16/7/2008 at 6:01pm
 Location: Milton Keynes
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Quote: Originally posted by happybonzo on 14/7/2008
Why not just get a Cig lighter adapter from Maplin? Got to be easier

Right up to the point when you can't start the car..

-------------
Paul



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