make your PSP boot up from the Memory Stick, enter the service mode, then downgrade&unbrick your PSP easliy 1) Capacity:3.6V 1800mAh 2) Lithium-ion rechargeable battery3)Colour red 4) make your PSP boot up from the Memory Stick, enter the service mode, then downgrade&unbrick your PSP easliyAdditional: Can be converted to normal battery by our psp battery charger