Hacking 3in1 sleep mode on gba games

[MFDC12]

well i flashed my dump of the minish cap to my 3in1 (NOR, not plus version, gba sized), and, unlike my cart, when I go into the games start menu and hit sleep, it looks like it is going into sleep mode for a half second but then it turns back on. do all 3 in 1's do that?
i dont really want to waste battery having it on all the time.
thanks in advance

edit: does the same thing in my gba.
i can use my original cart if i have to, its no problem really, just dont like using my carts anymore

 

[Mbmax]

With what kind of slot-1 flashcart you flash GBA games into your ez 3in1 ?

 

[how_do_i_do_that]

3in1 doesn't support sleep mode (as in it doesn't have the hardware to do it).

 

[MFDC12]

3in1 doesn't support sleep mode (as in it doesn't have the hardware to do it).

ah, that explains it. ty.