52Pi 18650 UPS With RTC & Coulometer Pro Power Supply Device Extended Two USB Port for Raspberry Pi 4 B / 3B+/ 3B - HiTechChain
power supply - Hiw to build UPS using TP4056 and 18650 Batteries? - Electrical Engineering Stack Exchange
Amazon.com: Geekworm for Raspberry Pi 4 UPS, X703 18650 UPS Shield with Auto Power On Function for Raspberry Pi 4 Model B Only(Support one 18650 Battery) : Electronics
UPS Module for Jetson Nano Dev Kit
Raspberry Pi 4B UPS 18650 Power Supply Board DSTIKE 18650 Pi Partner V – MakerFocus
Jetson Nano uninterruptible power supply (UPS) module supports 4 18650 – ELEDIY | Electronics do it yourself