You can't,
as you'll be needing the 1.50 kernel, also slim batteries cannot be turned into a pandora's battery.
You could try with a method I saw over at www.psp-hacks.com, in wich you create a pandora battery with a hardware modification of the battery, you just need to solder a cable between certain points.
So if you're skilled enough or know someone who is, you can try that
edit: be careful I just saw someone that said he tried to open it with a knife and it exploded
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