The rated voltage of 4s is 14.8V and can reach up to 16.8V when fully charged. If the battery is not needed urgently, it is recommended to charge it with 0.1c=0.1*5200mA=520mA. it's slower, it's Battery life is good; If it is needed urgently, it can be charged with 0.3c=0.3*5200mA=1560mA.
The 4.1V lithium battery for model aircraft can generally be stored for about three years.
When the model's lithium battery is not in use, it should be fully charged to 50% to 80%, and then placed in a dry and cool place.
In order to maintain battery life, it should be charged every three months to avoid irreversible loss of life due to long-term dormancy.