I do about the same - I put a token bid in to make other bidders know that I am interested and to try and intimidate them. This has worked to my advantage...hmmm...let's see exactly 0 times. LOL Good luck on bidding!!!
All I have is an original Gameboy Advanced and it does not work with that. So my guess would be that it would not work with the GBA SP. Nintendo tends to use different charging ports for each different console as a way to generate more revenue. LOL!!