The usage time of a 12V lithium battery (also known as battery life) depends on several factors, so an exact fixed time cannot be given. The following are the main factors that affect the use time
of 12V lithium batteries
Battery capacity
Battery capacity is usually measured in mAh (milliampere-hours) or Ah (ampere-hours). The larger the capacity, the more power the battery can store and the longer it will last.
Discharge Current
The amount of current that the device draws from the battery. If the device requires a higher current to operate, the battery life will be shortened.
Cell efficiency
The efficiency of the battery during discharge. The higher the efficiency, the more efficiently the battery converts energy and the usage time will increase accordingly.
Device power
The power of LED lights or other devices. The higher the power, the more power the device consumes and the less battery life it will have.
Battery health
The performance of a battery gradually decreases over time. Aging batteries will have less storage capacity and less time to use.
External conditions
Environmental factors such as temperature, humidity, etc., can also affect the life time of the battery.
Suppose you have a 12V 4000mAh (or 4Ah) lithium battery, and the LED light needs 1A current to operate, then theoretically, this battery can last for 4 hours (because 4Ah ÷ 1A = 4h). However, please note that this is only a theoretical value, and the actual usage time may vary due to the above factors.
In order to get a more accurate battery life, you can make a simple calculation based on the power of the device and the capacity of the battery, or determine it by testing in actual use. At the same time, in order to prolong the life of the battery, it is recommended to follow the correct charging and discharging methods and maintain the battery regularly.