Hongli 14500 lithium-ion rechargeable batteries
These are cylindrical Li-ion batteries with a nominal voltage of 3.7V.
The form factor 14500 indicates dimensions of approximately 14mm (diameter) x 50mm (length), similar in size to a standard AA battery.
Available capacities for these cells can range from 800mAh to over 2000mAh, depending on the specific model and quality.
Common applications include use in flashlights, emergency lights, trimmers, handheld fans, and various DIY electronic gadgets.
They feature high energy density and a longer storage life compared to older battery technologies like NiMH.