Actually two questions: I have a new PSP Slim with FW 3.8 on it and i want CFW 3.71M33. 1. If i dont want to harm my original PSP slim battery, which battery do i need to buy to Hardmod (by removing pin 5): a new PSP Slim battery or an new PHAT battery. 2. Will i be needing that battery after again, or is it a one time thing? thanks in advance.