All cell phone batteries are consumables, life expectancy is limited, which means that the capacity and life of the battery will eventually decline, Apple's official after-sales regulations: battery efficiency in a year below 80%, you can enjoy free replacement services, so many people think that the battery life below 80%, you must replace, in fact, this understanding is not entirely accurate, and this free replacement there is an additional condition, that is, the battery cycle Not more than 500 times!
This provision, mainly to ensure that the phone generated by the battery failure, is indeed based on the quality of the battery problems caused!
First, let's look at what is meant by battery capacity?
Battery capacity refers to the size of the battery storage power, cell phone battery capacity in mAH, the Chinese name is mAh, meaning that the phone works for an hour, how much mAh power consumption, but the phone works, the power can not be a constant value decreases, but also by the screen brightness, the operation interface of the screen speed, and even the use of environmental conditions such as temperature, and in the use of the battery, the actual battery Capacity will gradually shrink, which is also a normal phenomenon of battery aging, this is because in the process of use, the lithium battery internal side reactions occur constantly, such as electrolyte decomposition, dissolution of active substances, lithium ion precipitation, these irreversible effects, will lead to the battery can not provide sufficient power for cell phone operation, thus affecting the full performance of the phone!
Under normal circumstances, the capacity of a lithium-ion battery, will be slightly less with the completion of each charging cycle. Brand new battery capacity for one year will not be less than 80% of the original battery capacity, unless there is a problem with the quality of the battery, otherwise, according to the rated power of the phone, the brand new battery in the number of charging cycles to 500 times, the battery should be able to maintain a minimum of more than 80% of the initial capacity, and only 365 days a year, even if the battery cycle once or twice a day, after a year, the efficiency of the brand new battery should be more than 80%, here It is important to note that this 500 times refers to the number of cycles, that is, the charging cycle, and not the number of charges!
Secondly, what is meant by charging cycle?
Your iPhone battery completes a charge cycle if the consumed battery power reaches 100% of the battery capacity, but not necessarily through a single charge. For example, you may use 75% of the battery power one day and then fully charge your iPhone during the night. On day 2 you use 25% of the battery, then the total discharge reaches 100%, and a cumulative total of two days completes a charge cycle. It may also take longer to complete a charging cycle. After a certain amount of charging, the capacity of any type of battery will decrease.
In the course of using the phone, the battery is aging every day, there is no uniform rule when to change the battery, when the battery is below 80%, the performance impact caused by battery aging is becoming more and more obvious, such as longer time to launch APP, such as refresh speed is reduced, the backlight becomes dark, depending on the state of the battery and the tasks handled by the phone! So in addition to looking at the battery health values, what other phenomena suggest we should replace the battery?
Finally, what are the signs of battery aging and damage?
1.charging and discharging very quickly
Charging is charged quickly and consumed quickly, or charged very slowly and consumed quickly.
Battery bulge, even the screen also topped up, this situation to immediately replace the battery, because the screen is much more expensive than the battery!
3.the battery power will jump around
The original battery may only have a few percent of power left, but if you charge the phone, the power suddenly becomes tens of percent!
4.the phenomenon of false power, Still shutting down with power
Obviously there is at least 1 ~ 20% of the electricity, but this power does not power the role of the phone will shut down, plug in the charger, and will show that there is power.
5.Standby power loss serious
The phone is fully charged, placed overnight, up in the morning, if the power is dropped more than 10 cells, the battery is either aging seriously, or the motherboard leakage!
If your iPhone has the above situation, basically the battery is aging or damaged, then you need to consider replacing the battery with a new one, rather than focusing on the health index of the battery!
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