Renogy 12-Volt 100AH LiFePO4 Deep Cycle Lithium Battery Over 4000 Cycles, BMS, Backup Power for RV Marine, Maintenance-Free RBT100LFP12S-G1 - The Home Depot
Lithium-ion Battery for the BlueROV2 and Other Subsea Applications
Lithium Ion Cylindrical Battery - 3.7v 2200mAh : ID 1781 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits