If it is 350MA output, your battery charging time is: battery capacity *1.5/350. For example, if your 18650 lithium battery capacity is 2400MAH, it is 2400*1.5/3500=10.28 (hours), but now lithium The indicator on the battery charger does not work properly for some special reasons. You may use your voltmeter to test the voltage of your battery. If the voltage is in the range of 4.2V-4.3V, the battery is full. Now More than 95% of the lithium battery chargers are protected, while the general 18650 lithium batteries are mostly 2000MAH-2600MAH, so your charger can be fully charged after charging for more than 10 hours, and you don't have to consider overcharging. Problem. Battery charger heating is common now. If your battery temperature is relatively low, it means that the charger is not charging the battery. The battery is hot during the initial period of charging (0-6 hours). The link you gave is not open, I don't know which charger you are using.
The charging process of a High Temperature Resistance 18650 Battery can be divided into four stages: trickle charging (low voltage pre-charging), constant current charging, constant voltage charging, and charging termination.
The basic requirements for a High Security 18650 Battery charger are the specific charging current and charging voltage to ensure safe battery charging. Additional charging assistance functions are added to improve battery life and simplify charger operation, including trickle charging, battery voltage detection, input current limiting, shutdown of the charger after charging is completed, and automatic discharge of the battery after partial discharge. Start charging, etc.