Laptop charger voltage...

This is the place for any magazine-related discussions that don't fit in any of the column discussion boards below.
Post Reply
User avatar
Posts: 1798
Joined: Fri Feb 01, 2002 1:01 am
Location: Mideast USA

Laptop charger voltage...

Post by Externet » Tue Jan 02, 2018 5:48 pm

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 ?

----> ... 516HN9V2K7
- Abolish the deciBel ! -

User avatar
Posts: 2843
Joined: Thu Aug 01, 2002 1:01 am
Location: San Jose CA

Re: Laptop charger voltage...

Post by haklesup » Fri Jan 05, 2018 1:46 pm

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.

Post Reply

Who is online

Users browsing this forum: Bing [Bot], Google [Bot] and 10 guests