This is interesting. I wonder why some genuine carts have a quiescent current and tetris doesn't
Edit: I remember, Tetris is one of a few games that don't use MBCs. The quiescent current is probably that of the MBC
I hadn't looked into GB flash carts, but for GBA I was warned away from the EZ Flash Omega because apparently it used more power than the equivalent (more expensive) Everdrive. I'd be interested to see the numbers behind that.
makho has a video on the power usage of the EZ Flash Omega DE versus some other flash carts.[1] He's also put together a spreadsheet with his results.[2] Essentially the EverDrive would result in a runtime about 90% of an original cart, with the EZ Flash Omega DE coming in at 80%. The original EZ Flash Omega would last about 70% of the time of an OEM game.
Tetris just has a ROM chip. The other official carts have ROM, a bank switching chip, static RAM and a power switching chip (to switch the SRAM from the internal battery to Gameboy power). So there's just more stuff on the board that can drain power.
Edit: Dang, you remembered whilst I writing my reply...
Yeah, incidentally I've written a gameboy emulator and only remembered because I never implemented any MBCs and so it only played Tetris and Bubble Ghost
Edit: I remember, Tetris is one of a few games that don't use MBCs. The quiescent current is probably that of the MBC
I hadn't looked into GB flash carts, but for GBA I was warned away from the EZ Flash Omega because apparently it used more power than the equivalent (more expensive) Everdrive. I'd be interested to see the numbers behind that.