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 Post subject: Laptop charger voltage...
PostPosted: Tue Jan 02, 2018 5:48 pm 
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Joined: Fri Feb 01, 2002 1:01 am
Posts: 1763
Location: Mideast USA
At the beginning, the laptop battery packs were over 14V and the chargers about 18V-19V. Understandable.
Now, some laptop packs are 11V, and still use the higher supply to charge them. Why ?
Why a 12V nominal automobile 'outlet' cannot directly supply/charge a 11V laptop ?

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 Post subject: Re: Laptop charger voltage...
PostPosted: Fri Jan 05, 2018 1:46 pm 
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Joined: Thu Aug 01, 2002 12:01 am
Posts: 2812
Location: San Jose CA
I think you probably could charge direct from a car but since that source is not regulated, it might e a bit hard on the battery or charging circuits. Not running, my car battery hovers at 11.4 (its a little old) and when running is 14.5. With the car running it might work OK but with the car off, you would need a fresh battery and it would still charge slow.

There may be another reason too. the charging circuit within the laptop may also have a minimum source voltage to work and had a voltage drop across itself.

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