Hacking Best way to play gba w EZ-flash V and 3-in-1?

[Sao Mortel]

I don't understand how to manage my gba games (saves).
As i would understand the best way is to flash the rom in play it as long as you want and then backup the save when you want to change the game.
But i was unsuccessful as the game does not keep the save when i turn my DS off...
Can someone tell me the best way with the button to press.

 

[Sao Mortel]

No one has a EZ-flash V?? Anyways with more tought into it my 3-in-1 must have came in with a dead battery. ordered some to see if that will do.