What kind of extension cord should I get for my laptop?

I live in a condo with a balcony, but there isn't an electrical outlet to use while sitting outside.
I would like to use my Lenovo laptop computer and not use the battery's power.
What type of extension cord should I get?
It does NOT need to be weather-proof, but I assume a regular cord isn't going to be correct.

Guest

I would get one with a power surge in case it starts storming while youre using it

Pearl L

A long one!

The regular extension cord will do but to be safe, buy one that has thick wires.

keerok