Battery States/[ROM-Filename]/[ROM-Filename].sav
..mcr
.sav
.mcr
via:Battery States/[ROM-Filename]/
[ROM-Filename].sav
(rename it to match if it is not).+
button to create a new save state. You can also tap on an existing save state and choose to overwrite that state with a new one. This cannot be undone, so be sure that you either backup the save state before doing this if you wish to keep it.