Amazon.com: Skywolfeye 4 PCS 5000 Button Top Battery for Camera Doorbell, Flashlight, Headlamp, Electronic Devices. : Health & Household
DIY: How to revive a dead 18650 (or any) Li-ion battery cell - YouTube
Amazon.com: 18650 Battery Charger 4 Bay Smart Universal Charger for Flashlight Headlamp Battery 3.7V Rechargeable Lithium Li ion Batteries Compatible 18650 26650 21700 10400 Battery Charger (Only AC Charger) : Electronics
Does charging 18650 li-ion batteries to 4.3+ V damage the cells? The cells have been recovered from dead laptop batteries, and the charger is bought from China. What are the risks involved? -
Lithium-Ion Battery Circuitry Is Simple | Hackaday