1. Under normal circumstances, all batteries will experience a voltage drop after being fully charged. The voltage after the drop is called the "open circuit voltage", and the voltage at the time of full charge cutoff is called the "charging limit voltage". The rated voltage of lithium iron phosphate batteries is 3.2V

    2. The voltage of the battery drops after being fully charged, as long as it is not very large, it can be said that it is normal. If the drop phenomenon is too fast, the biggest possibility is that there is a problem with the quality of the battery, such as high internal resistance and large self discharge

    3. The charger is unstable and mismatched. Under normal circumstances, lithium-ion chargers are charged with constant current or voltage. When the current drops to the actual level or even mA, it will stop. If the charging is not in place, there may be a voltage drop problem

    Storage of lithium batteries after being fully charged depends on the storage time. If stored for a long time, such as one year, it will definitely fall back because there is self discharge inside lithium batteries. Lithium batteries are generally stored between 70% -80%, and this range is the most suitable after testing

    Additionally, it is recommended that if the storage time reaches around six months, it is best to perform a discharge management. If there is a protective board, it is recommended to shorten the time to three months for a discharge, as the protective board consumes electricity and will be faster than usual

    There are two other reasons. The first thing to consider is the duration of use of lithium batteries. If used too long, it can lead to a decrease in electric shock function, which is a decrease in lifespan. Then, it depends on the size of the battery load and whether it matches. Finally, it is necessary to check if there are external factors such as leakage in your circuit system

    Summary:

    1. Due to the high current of the load, the battery discharge function is not functioning properly, which can cause a drop phenomenon

    2. Due to the aging of the battery, the capacity of the battery is low, and when it falls back