Lithium Ion Polymer Battery with Short Cable - 3.7V 420mAh : ID 4236 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
LiTime 12V 200Ah PLUS Lithium LiFePO4 Battery, Built-in 200A BMS, 4000+ Deep Cycles, Max 2560W Power Output, FCC&UL Certificates, 10-Year Lifetime, Perfect for RV, Solar, Marine, Off-Grid, etc.
Lithium Battery Smart 12,8V & 25,6V - Victron Energy