I wanna dump one custom ROM on a GBA cart, so it boots up automatically as if it was a real GBA game. I also don't want a battery-saving issue where the card would have an internal battery that it relies on for saves. I'm not sure if the EZ Flash IV would be the best fit for this, as I don't really want to waste one on a single ROM, but Is formatting that cart to a single ROM possible? I think the EZ Flash 3 in 1 fat might be the best option for me, but I'm not exactly sure about that internal battery it has inside? Is that for RTC or will the cart crap out when it runs out?