3.2 Volt LiFePO4 18650 Button Top Batteries (1200 mAh)
3.7V 1200mAh Rechargeable Lithium Polymer Battery - Lithium ion Battery Manufacturer and Supplier in China-DNK Power
Amazon.com: LP PSP S110 Battery, 1-Pack 3.7V 1200mAh Li-ion Rechargeable Battery, Compatible with Sony Play Station PSP 3000, PSP 2000 Series, PSP Lite, PSP Slim, PSP-S110 Console : Video Games