If you still have the older ones's battery
you could hard mod it, being really careful I might add
and use the 4GB memory stick to create a magic memory stick with a GUI, It works with 4GB. I know this because I did it when I bricked my phat and I didn't had other memory stick than my 4GB
So, as long as you have your old battery you'll be fine, and without needing to spend a dime
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