2x 3.3V LiFe Battery 3300mAH to Tria TRH25 laser SunKing Pro solar light 26x65mm 694090632243 | eBay
LithiumWerks ANR26650M1-B, 3.3 Volt, 2.5 Ah, Lithium Iron Phosphate (LiFePO4) Battery using Li-Ion NanoPhosphate® Technology
Mini Boost Buck DC Board 1.8-5V to 3.3V, for Battery Juice R2 – ElectroDragon
It Just Got Easier to Convert Lithium-Ion Battery Voltage to 3.3V with this Efficient Single Inductor Synchronous Buck-Boost Regulator | Analog Devices
Variable Voltage Battery 3.3v - 4.8v w/ Charger — Extracts Academy