GlowCity Replacement Extra Long Life 3v Lithium ion CR2032 Coin cell B – GlowCity LLC
Panasonic CR123A CR123 CR 123 123A 3V Lithium Battery disposable lithium ion battery for the red LED of flashlight|Primary & Dry Batteries| - AliExpress
Varta CR 1/2 AA 3V Lithium Battery CR14250 - BatteryJunction.com
Tenergy 30264 RCR123A / 16340 600mAh 3V Protected Lithium Ion (Li-ion) Button Top Battery - Boxed, Sold Individually
It Just Got Easier to Convert Lithium-Ion Battery Voltage to 3.3V with this Efficient Single Inductor Synchronous Buck-Boost Regulator | Analog Devices