The lifespan of a lithium battery is "500 times", 500 times of charge and discharge. If it exceeds this number, the battery will be "at the end of its life".
The lifespan of a lithium battery is “500 times”, which does not refer to the number of charges, but to one cycle of charging and discharging.
A charge cycle means that all of the battery's energy is used from full to empty, then charged from empty to full. This is not the same as a single charge. For example, a lithium battery only uses half its power the first day and then charges slowly. If it is still the same the next day, i.e. if you charge it half and charge it twice in total, this can only be counted as one charging cycle and not two.
Therefore, multiple charges may typically be required to complete a cycle. Each time a charge cycle is completed, the battery capacitydecreases a little. However, this reduction in power is very small. High quality batteries retain 80% of their original capacity after being charged several times. Many lithium-ion powered products are still in use after two or three years. Of course, lithium batteries still need to be replaced once their lifespan is reached.
How to identify?
1. Compare battery capacity.
General nickel-cadmium batteries have a capacity of 500 mAh or 600 mAh, and nickel-hydrogen batteries are only 800-900 mAh; while the capacity of lithium-ion batteries for mobile phones is generally between 1300-1400 mAh, so lithium batteries are used. once they are fully charged, the time is about 1.5 times that of nickel-hydrogen batteries and about 3.0 times that of nickel-cadmium batteries. If you notice that the lithium-io batteryIf the cell phone you purchased does not work as long as advertised or specified in the manual, it may be counterfeit.
2. Look at the plastic surface and the plastic material.
The original battery has a uniform wear-resistant surface and is made of PC material, which is not brittle. Counterfeit batteries do not have a wear-resistant surface or are too rough and are made from recycled materials. are prone to fragility.
3. Measure the charging voltage of the battery pack.
If a nickel-cadmium or nickel-hydrogen battery pack is used to simulate a lithium-ion cell phone battery pack, it must be composed of 5 single cells. The charging voltage of a single battery generally does not. exceeds 1.55 V and the total battery pack voltage does not exceed 1.55 V. More than 7.75 V When the total battery pack charging voltage isless than 8.0 V, it may be a nickel-cadmium or nickel-hydrogen battery.
4. For original batteries, the color and texture of the battery surface should be clear, uniform, clean, without obvious scratches or damage; the battery brand must be printed with the model, type and rated capacity of the battery. , standard voltage and normal voltage. Negative pole mark, manufacturer name.
It must be smooth and unobstructed, have a suitable seal, fit the hand well and have reliable locking; the material must not have obvious scratches or black or green spots. If the battery of the cell phone we buy does not conform to the above phenomenon, we can initially conclude that it is fake.
5. From their own perspective, many mobile phone manufacturers have made efforts to improve their know-how to make TVsmobile phones and their accessories more difficult to counterfeit, thus further curbing the proliferation of counterfeits and parallel imports.
Common mobile phone products and accessoriesConsistency of appearance is required. Therefore, when we install the battery of the mobile phone we purchased, should we carefully compare the body and the bottom case of the battery? If the color matches, it is an original battery. Otherwise, the battery itself is dull and dull, and it may be a fake battery.
6. Observe charging anomalies. Generally, genuine cell phone batteries must have an overcurrent protector inside, which automatically cuts off the circuit when an external short circuit causes excessive current to avoid burning or damaging the phone. Lithium-ion batteries also have an overcurrent protection circuit, who can be ; used when non-standard electrical appliances are used, when the power supply current is too large, the power supply will be automatically cut off, resulting in charging failure under normal conditions of the battery, it can automatically return to the conductive state. If during the charging process we find that the battery seriously overheats, smokes or even explodes, it means that the battery must be fake.
References:
The theoretical life of ternary lithium batteries is about 800 cycles, which is average among commercial rechargeable lithium batteries. Ternary lithium battery refers to a secondary lithium battery that uses three transition metal oxides: nickel, cobalt and manganese as the positive electrode material.Fully integrating the good cycle performance of lithium cobalt oxide, the high specific capacity of lithium nickel oxide and the high safety performance and cost savings of lithium manganate, using methods such as molecular level interweaving, inclusion, coating and surface modification to synthesize nickel, cobalt, manganese, etc. Synergistic multi-element composite oxide integrated with lithium. This is a rechargeable lithium-ion battery that is currently widely researched and used. New energy vehicle batteries generally use ternary lithium batteries. The advantages of this type of battery are sufficient power and less pollution. The normal life of qualified ternary lithium batteries is 8 years, and the specific mileage is 150,000-200,000 kilometers. Ternary lithium batteries cooperate well and have the most powerhigh for the same weight. However, if the items are packed tightly, the temperature will be a little high. Therefore, ternary lithium batteries have very strict heat dissipation requirements. To ensure safety, each battery must have a safety device.