You can purchase an Auto Power Adapter/Charger from Compaq
(#401043-B25) which is supposed to be an option for the
E500. Or, you can purchase a generic adapter. These adapters
will charge the internal battery as well as operate the
computer from your 12 supply.

Good luck!

Chuck

Geert Maene wrote:
I want to connect a Compaq ARMADA E500 to a 12V batteries. The adapter
from the notebook gives my a 18,5V/2,7Amp.
Do I need a special converter? (where can I buy one)
Does anyone knows a wiring Diagram?

Geert Maene