1. The most direct algorithm:
First get the current of the electrical appliance, then divide the battery capacity by the current of the electrical appliance. The result is the duration of use.
For example:
A 3000mAH battery with a rated voltage of 5V powers an electrical appliance with a power consumption of 2.5W and a voltage of 5V. Its theoretical useful life is . :
I=P/U => 2.5w/5v => 0.5A => 500MA.
3000mAh means that a current of 3000MA can be discharged for one hour,
3000/500=6 hours.
2. Coulomb charge algorithm:
C=IS => 3A*3600s => 10800c Coulomb (charge).
Electric energy 10800c*5v=54000w.
54000w/2.5w=21600/3600s=6h.
Detailed information
Advantages of lithium batteries:
1. It has a high storage energy density, reaching 460-600 Wh/kg, about 6-7 times that of lead-acid batteries.
2. Long service life, service life can reach more than 6 years. The battery with lithium iron phosphate as the positive electrode has a charge and discharge record of 1C (100% DOD), which can be used 10,000 times.
3. The rated voltage is high (the operating voltage of a single unit is 3.7V or 3.2V), which is approximately equal to the series voltage of three nickel-cadmium or nickel-cadmium rechargeable batteries. metal hydride. , which facilitates the formation of a battery power supply; Lithium batteries can be a new type of lithium battery voltage regulator technology that adjusts the voltage to 3.0V to adapt to the use of small electrical appliances.
4. She has high power endurance. Among them, the lithium-ion iron phosphate battery used in electric vehicles can achieve a charge and discharge capacity of 15-30°C, which qui makes starting and accelerating at high intensity easier. .
5. The self-discharge rate is very low, which is one of the most important advantages of this battery. It can generally be less than 1%/month, or less than 1/20 of it. nickel-metal hydride batteries.
6. Lightweight, the weight is about 1/6 to 1/5 of lead products in the same volume.
7. It has strong adaptability to high and low temperatures and can be used in the environment of -20℃ to 60℃. After treatment, it can be used in -45℃ environment.
8. Green and environmentally friendly, regardless of production, use or disposal, it does not contain or produce toxic and harmful heavy metal elements and substances such as lead, mercury and cadmium .
1) Use a lithium battery capacity cabinet to test the battery capacity,
2) Use a resistor testerinternal lithium battery ance to measure the internal resistance of the battery; if the battery is added, just use the complete lithium battery tester to test the finished battery from the protection board!
Of course, there are also certain ambient temperatures, as well as drop tests, shock tests, high voltage charging, etc., just follow the specification requirements!