Not 18650 but related. Recently I've been salvaging li ions from disposable vapes. Usually they are between 2.6 and 3.3v depending on how long it's been sitting. This one was at 1v.
Amazon.com: RAYNAKS Total MAX Output Current 4000mAh RC217 Quick Fast Speedy Charger 3.6V 3.7V 4.2V 21700 20700 18650 Circuit Protected Li-ion Rechargeable Batteries : Toys & Games