MGB Rechargable Battery Help

After a crazily long time, I've decided to re-take up this project. So much has happened in the past year, but I'm finally ready!

I have just two questions to ask before starting;
What's around the highest limit a gameboy can take (in mHz - ie I have 4, 8, 10, 16 and 20 mHz crystals.)

Aaannddd I want to use 3 crystals now. The 4mHz crystal, the 8mHz (double) crystal, and whatever the highest out of the crystals I have which I can use. So how can I use 3 crystals and which switch would I use. Is there a switch like ON/OFF/ON/ON or something similar..?

Any help anyone?
And this time, I'm actually doing this.
 
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