not without modifying the slim battery; you have to remove the tabs so it'll fit in the fat. or you have to hold the battery at an angle so it'll touch the contacts.
best is to use a fat battery. works on both fat and slim, without physically modifying it.
oh,i actually deleted my flash 0 files (3.71 cfw),will it be ok if i use pandora, cos i have heard about this nand dump thing,and never ending loop,can anybody please clarify thats if its safe.
well me and my friend were playing are psps and he had a low psp(fat) battery that was half dead and my psps(slim) battery was full. so we traded for a few min. it worked fine but the psp(slim) battery will not last as long in your (Fat) psp.
@ projewell
i want to unbrick my psp thats y i'm asking about psp slim battery not for using it,also plz tell me about nand dump,will i be safe if i use pandora from fat psp(i delted my flash 0 files,and no recovery mode).