TP4056 is a complete linear single-cell lithium-ion battery charger that can charge two lithium batteries connected together at the same time:
1. of total capacity. The maximum charging current of the TP4056 is 1 A. If the total battery capacity is too large (e.g. 5 Ah or more), even if the charging current is set to 1 A, charging will take a very long time if the total battery capacity is low (for example). like 500mah or less), charging will take a long time. At this point, the charging current should be set to approximately one-third to one-half capacity. Excessive charging current is not only harmful to the lithium battery, but also. may cause undercharging, battery heating, etc. due to the internal resistance of the lithium battery.
2. At the same time, it should also be noted that the capacity of two parallel lithium batteries should be close, preferably the same modele and from the same batch. For example, if there are two batteries, one is 2000mah and the other is 500mah. When the charging current is set to 1A, it will not damage the 2000mah battery. However, for the 500 mah battery, because the charging current is determined by. the two batteries connected in parallel. When the battery is shunted, the charging current of a 500mah battery may reach 500mA or more (when the internal resistance of the battery is low), which will damage the 500mah battery.
1.
Charger failure. The flashlight charger is relatively simple. This is a charging circuit for a single 18650 lithium battery. Its output voltage is 4.2V and the current limit is approx. 500mA, this type of charger usually has an indicator light that shows green when not charging, red when plugged in with a flashlight to charge and green again when is completefully charged, so you can roughly judge whether the charger is normal according to the value. Indicator light display. The precise method is to use a multimeter to measure whether the output voltage is 4.2V. Otherwise, the charger circuit is faulty or the charging head wire is broken. If you have the basics of the circuit, you can repair it. Otherwise, you can only replace it with a charger of the same model, sold on a certain website.
2.
The internal fault of the flashlight is relatively simple. It consists of an 18650 lithium battery, a switch, a charging socket, an LED tube and one or two currents. -limiting resistors, the most easily damaged parts of these simple things are the switches and the load