I forgot to mention that the 2 cell battery charger stopped charging. when batteries are placed in it the red light comes on and starts flashing. If an 18650 battery is nor charged properly it could be damaged or possibly catch fire. Do not use it if that happens and never leave the charger charging without supervision. LIKE LEAVING THEM ON OVERNIGHT. Check them often
and feel them to check for overheating. stop charging as soon as the charge light turns green. This is true for MOST CHARGERS unless The charger is a smart charger or the 18650 has a charge controller built in.
I would ask for replacement as I have many 18650 batteries but probably it would not be replaced.