Insten Replacement Battery Pack for SONY PSP 1000 1001 High capacity 1800mAh 3.6V Never run out of battery power when you are about to score the winning point. Save money and protect the environment by using the rechargeable battery Battery need to be charged before first use Voltage: 3.6V Compatible With: Sony PSP 1000 ONLY (NOT Compatible With PSP Slim 2000)