YRang 4000 mah Flat Top 3.7V 18650 Battery Rechargeable Li-ion Batteries for Flashlight Headlamp Lantern (10)

The highest rated LI-ON 18650 is the Samsung 36G, at 3600. And that battery costs $15 each. The next best is 3400. So a 4k battery is literally impossible. Take your lies somewhere else...