Multifunctional DIY Mini DC-DC Lithium Battery Boost Module Step Up Board Converter 3.7V to 12V Voltage Regulator Adjust 5V/8V/9V LED Indicator - Walmart.com
Amazon.com: Taidacent 10PCS 3.7V to 12V DC-DC Boost Step Up Converter Boost Converter Module 3.7V Lithium Battery Power Booster 12V Voltage Regulator : Electronics
DIY 3.7V to 9V Boost Converter Circuit using MC34063
Multifunctional DIY Mini DC-DC Lithium Battery Boost Module Step Up Board Converter 3.7V to 12V Voltage Regulator Adjust 5V/8V/9V LED Indicator - Walmart.com
It Just Got Easier to Convert Lithium-Ion Battery Voltage to 3.3V with this Efficient Single Inductor Synchronous Buck-Boost Regulator | Analog Devices