Battery capacity refers to the total amount of electricity that the battery can store, which is an important parameter to measure the performance of the battery, and plays the role of intermediate value in calculating the runtime of 12V lithium battery. Generally speaking, the capacity of lithium battery can be expressed in Ah or mAh, both units are battery capacity units, you can complete the conversion between the two units by the following formula, namely
1Ah=1000mAh
Of course, the battery capacity of lithium batteries can also be expressed in Wh, 1Ah means that the battery can be discharged at 1A current strength for 1 hour, 1Wh means that the battery can be operated at 1Watt power for one hour, although both of them can describe the battery capacity, but there is a certain difference in the nature of the two units, Wh can be converted to Ah by the following formula, assuming that the battery operating voltage is expressed by the symbol V The number of ampere-hours of lithium battery is EAh, and the number of watt-hours of lithium battery is EWh, then
EAh=EWh/V
For example, a 120Wh lithium battery, its operating voltage is 12V, substituting the above formula can be obtained that the battery capacity of this lithium battery is 10Ah.
Load current refers to the load in the circuit (including light bulbs, refrigerators, portable air conditioners and other electronic devices) in operation when the current consumption, simply put, like lithium batteries such as the power supply to maintain the load needs to provide the normal work of the current. Load current is an indispensable parameter for calculating how long a 12V lithium battery can run.
The most direct way to get the load current is to use an ammeter to measure the current in the circuit, so that the data is more accurate, but this process involves professional electrical knowledge, you’d better ask a professional to complete the work, which is what you need to pay attention to.
After getting the battery capacity and load current size, you can use the formula to derive the running time of 12V lithium battery, first of all, you need to clarify the physical quantities, EAh is used to represent the 12V lithium battery capacity, I is used to represent the load current size, t is used to represent the running time of 12V lithium battery, then the formula is
t=EAh/I
For example, assuming that your 12V lithium battery battery capacity of 50Ah, the load current size of 5A, then substitute the above formula to get your 12V lithium battery running time of 10 hours, of course, different operating voltage lithium battery can also use the above formula to calculate the lithium battery running time, which is what you need to pay attention to.
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