B44
 

I have a b44. What esc combo can use with 2s lipo?

Any :)

Or if you want specifics for what brand should you look at..

LRP, Nosram, Novak, Speed passion, Tekin etc.. etc.. etc

You need to provide a little more information if you want people to be able to help. For example: Brushless or brushed, what motor have you got, what batteries have you got, do you want to go racing with it or not, Does it need to have reverse, etc.

All those things are important if you want usefull answers.

I don't have motor.i would like a combo system and my batteries are 7.4v 2s 4000mah.

You still need to provide the correct info.
You don't have a motor and are after a "combo" so I assume you don't have an ESC either?

Just to re-iterate Paul's post - ANY 10th BRUSHLESS ESC AND MOTOR WILL WORK PERFECTLY WITH 2CELL LIPO.