1PCS 3.6V 1800mAh Rechargeable Battery for sony PSP 1000 PSP-S110 PSP1000 | eBay
File:Psp-battery-types.jpg - Wikimedia Commons
PSP Battery Mod Tutorial : r/PSP
2400mAh Replacement Battery Pack for Sony PSP 2000 2001 2006 3000 3001 3006 | eBay
For PSP 2000 and 3000 Replacement Battery Pack Rechargeable New 1200mAh 3.6V High Capacity for Sony PSP 3000 and PSP Slim 2000, Include Model PSP-2001, PSP-3000, PSP-3001, PSP-3002, PSP-3004 by Insten - Walmart.com
Sony PSP Battery - Original PSP Battery for PSP 1000 Models