Battery save support (or .sav files)

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What steps will reproduce the problem?
1. The easiest way to catch this problem is to play Virtual Boy Wario Land. 
Complete the first level (by finding the key and go up the elevator).
2. Go up again, and you'll be in a room that tallies up coins and treasure. 
Most importantly the game is saved here.
3. To be safe, go up again to start the second level. Exit the game and/or 
emulator.

What is the expected output? What do you see instead?
In the case of Wario Land, progress should've been saved after completing the 
first level. There should be a 1 in one of the save blocks, but all three 
blocks are blank as if it's a brand new save.

What version of the product are you using? On what operating system?
0.1

Please provide any additional information below.
Don't know if this will help, but when using Mednafen 0.9 WIP on the PC (the 
one that added VB support and the one I assume is the basis for this emulator), 
the save file, with wario.vb as the ROM name, appears in the sav folder as:

wario.fb4dc9f4ebd506702eb49e99a62bd803.sav

Original issue reported on code.google.com by xcinder...@gmail.com on 30 Jun 2011 at 2:57

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You can save the state explicitly by exiting back to the menu, going into "Save 
state management", and then clicking the "save state (current cartridge)" 
option. 

The next time you load the game, the save state will automatically load.

You can also configure the emulator to always auto save when exiting a game via 
the "Auto save" option in "save state management".

Adding battery save support is something I will look into for a future release.

Original comment by raz0...@gmail.com on 30 Jun 2011 at 5:34

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Original comment by raz0...@gmail.com on 30 Jun 2011 at 5:43