28 A123 System ANR26650M1B LiFePO4 26650 3.3V 2500 mAh Battery LiFe | eBay
OOZE 320mAh SLIM PEN TWIST 3.3V - 4.8V BATTERY with USB CHARGER | SINGLE PACK (MSRP $15.00each) - FS WHOLESALE
Amazon.com : 2 Pack - Replacement for Olympus C-3020 Battery - Compatible with Olympus CR-V3 Digital Camera Battery (1300mAh 3.3V Lithium-Ion) : Electronics
It Just Got Easier to Convert Lithium-Ion Battery Voltage to 3.3V with this Efficient Single Inductor Synchronous Buck-Boost Regulator | Analog Devices