Now you have to check all the outed games to see if they actually work. It was a major annoyance to me with the Supercard SD that different games required different settings to run. Like some worked with "restart" while others didn't, or they would run slow without "restart" (some just ran slow regardless). Some needed a saver patch while others didn't, some would work with real-time-save while others didn't. And then, some games just don't work no matter what you do. Then there are also some games, such as that Sega 4-game compilation (Outrun, Hang-On, AfterBurner, Space Harrier), where when it was converted one way would allow 3 of the 4 games to work, and converting another way would allow a different 3 games to work, but you could never get all 4 to work. Some games like a different converter version to convert properly.
Lot's of trial and error getting GBA games to run correctly on a Supercard SD. Trust me, you'll likely find many of them don't work as converted and you will have to mess around with options and install multiple versions of the converter and re-out many of them before they will boot.
A Supercard miniSD was my first GBA flashcart, I remember how much of a PITA it was to dork around with the converter options to make all the games actually work. And I set up my GBA and DS to be "pocket arcades" so I know all about the hassles with converting the games. Many, MANY hours were spent verifying them, and many more re-converting until I found the settings that worked for individual games.
If you actually batch convert 150 games for that Supercard SD and they ALL work and save, I'd be amazed.