Charging Dell laptop from 12V cigarette socket

[kje]

I wanna charge a Dell Latitude E6500 laptop from the cigarette socket (12V), and have now tried two Vanson laptop adapters (SDR-100W and SDR-120W). Both deliver a weak beeping and does not charge the laptop battery.

According to the regular power adapter the Laptop need 19.5V and 4.62A. On the laptop battery it says 19.5V and 3.5A minimum and 4.62A max.

Vanson SDR-100W Vanson Auto Power Adaptor 100W with Adaptors for Laptops Phones MP3 Players | eBay delivers 4.5A at 18/19/20V (you can switch between 18,19 and 20V). The plug fits into the power socket on the laptop and have "positive tip polarity."

Vanson SDR-120W Batterieliminator for laptop, 120W - VANSON | Clas Ohlson delivers up to 6A and can switch between 18,19 and 20V.

I bougth both the Vansons on a local shop here in Norway called Claes Ohlson.

Why do none of these charge my laptop battery?

This is my usual wall adapter:

I have another wall adapter; Vanson SMP-120W like this:

,
and that works with the same connection into the laptop as I tried with the SDR-100W and SDR-120W.

So why won`t the SDR-100W or SDR-120W charge the laptop? Is it because of wrong power spesifications? Or is it the plug?

 

[Leesparkykent]

Get a power inverter .

 

[kje]

I don't wanna use a power inverter because bad efficiency.
Any suggestions?

 

[Geordie Spark]

I don't wanna use a power inverter because bad efficiency.
Any suggestions?

Put your power adaptor in your microwave oven on full power for two minutes.

 

[egg67]

Is your cigarette lighter working?
If not then buy a new car, one with and aux point and all will be good ish. ( please note you can not light a cigarette with a aux point)

 

[telectrix]

or buy an artic with 24V electrics.

 

[tazz]

First check the voltage of you pc psu, off load....you may find you need a voltage higher than 19v

 

[kje]

I tried with different voltage, everything between 18V to 21V.
The voltage of my pc psu without load is 19.5V

 

[kje]

I now tried with two other laptops without battery (HP and Acer) with my DC DC step up converter and it worked.

I tried without the battery in my Dell laptop and that worked as well.

But I got a power warning at startup, and it won't charge the battery. I wonder if there is a workaround for that?

 

[amlu]

too much load and power supply goes into protection mode (and its beeping)?
car lighter socket messed up, has trouble providing 8A of current?
try with one of those, possibly hard-wired into the car,
150W DC-DC Boost Converter 10-32V Step Up to 12-46V MAX 8A Charger Power Module | eBay