Method 1:
Usually, manufacturers activate and pre-charge lithium-ion batteries before leaving the factory, so there is usually some excess charge in the battery. For newly purchased mobile phone batteries, as they are lithium-ion batteries, an adjustment period should be made during the first 3-5 charging processes, and they should be charged for more than 14 hours to ensure that the lithium-ion batteries are fully activated. Although lithium-ion batteries do not have memory effects, they still need to be fully activated to ensure optimal performance. Regarding the issue of first charging, the author consulted Samsung technical personnel, who replied that Samsung's original batteries have been fully activated before leaving the factory, so there is no need to use long-term charging methods to activate the activity of lithium-ion batteries. For the first charging, only the remaining battery charge needs to be used up, and then the battery can be fully charged. As far as I know, the statement made by Samsung's technical personnel is reliable.
2. Some automated intelligent fast chargers only indicate that the battery is fully charged by 90% when the indicator light changes. The charger will automatically switch to slow charging mode to fully charge the battery. Before the power supply of the charger is cut off, it is best to give the battery a period to replenish the battery until it is fully charged before starting use, otherwise, it will shorten the battery's usage time.
Before charging, the lithium battery does not need to be discharged and must never be discharged. Currently, none of the lithium battery chargers on the market have a discharge function. If the charger can adjust the charging speed, it is recommended to use a slow charging method as much as possible to reduce the use of fast charging. Moreover, whether it is slow or fast charging, the charging time should not exceed 24 hours. Otherwise, the battery may burn out the battery cells due to prolonged current input.
Many users still turn on their phones during charging, which can cause the battery to discharge outwards and also supply power inwards due to charging. This situation is highly likely to cause voltage disorder, causing the circuit board of the phone to heat up. If there is a power call at this time, it will generate an instantaneous backflow current, which will cause damage to the internal parts of the phone.
The length of battery life depends on the number of repeated charges and discharges. Lithium batteries can be charged and discharged approximately 500 times, and when this number is reached, the performance of the battery will be greatly reduced. To prolong the battery life, try to avoid recharging the battery after it is depleted as much as possible. Otherwise, as the number of repeated charges increases, the performance of the battery will gradually weaken, leading to a decrease in standby time.
6. Batteries should not be exposed to high temperatures or extremely cold environments. In hot summers, it is advisable to avoid exposing the phone to sunlight or placing it in a place directly blown by cold air. During charging, the current will generate a backflow, and it is normal for the battery to generate heat.
7. If the phone battery is not used for a long time, it is recommended to go to the phone repair department or use a DC voltage regulator to activate it yourself. You can adjust the voltage to 5-6V and the current to 500-600mA, and connect it in the opposite direction to the battery. It should be noted that the connection should be quickly released and repeated up to three times. After such treatment, the original charger can be used again for adaptation charging.
The longer the charging time, the better. For batteries without protective circuits, charging should be stopped promptly after being fully charged to avoid overheating and affecting performance. The method of calculating the theoretical charging time of a battery is to divide the battery capacity by the output current of the charger. For example, a battery with an 800MAH battery capacity, a charger with an output current of 500MA, and a charging time of 800MAH/500MA=1.6 hours. Of course, this is only the time when the theory is fully charged. After the charger shows that the charging is complete, it is best to replenish the battery for about half an hour. At the same time, lithium-ion batteries must use a dedicated charger, otherwise, they may not reach saturation state, which may affect their performance.
Method 2:
Lithium batteries are a durable product, so they do not need to be treated too pampered. We can use it without hesitation and the need for expensive original chargers. Generally speaking, a regular brand charger is sufficient, priced between 15 to 20 yuan. This can save the trouble of using a direct charging charger that is limited by the phone. There are two types of chargers: fast charging and slow charging. Fast charging takes about 2-3 hours, while slow charging takes about 10 hours. If multiple batteries need to be charged, choosing fast charging would be better.
In addition, the characteristics of lithium batteries eliminate the need for discharge and overcharging operations. The lifespan of a battery completely depends on the length of effective charging time. That is to say, even if you start charging after only using half of the battery, it will not affect the battery life.
Understanding Memory Effects
Battery memory effect refers to the performance of a battery that can be restored after failure and is a reversible failure phenomenon. The memory effect refers to the tendency of the battery to automatically maintain a specific working cycle after enduring it for a long time. This effect was first defined in the Nickel–cadmium battery, but the nickel-cadmium bag battery does not have a memory effect, while the sintered battery has this phenomenon. However, today's nickel Metallic hydrogen battery (commonly known as Nickel–metal hydride battery) is not limited by the definition of this memory effect.
Due to the process improvement of modern Nickel–cadmium batteries, the memory effect mentioned above has been greatly reduced. Correspondingly, another phenomenon called "lattice transformation" has replaced this definition. Generally, Nickel–cadmium battery is affected by both effects, but Nickel–metal hydride battery is only affected by the "lattice" effect, and its impact is smaller than that of Nickel–cadmium battery.
In practical applications, to eliminate memory effects, there is a strict set of standards and operating procedures. If not executed correctly, it may have the opposite effect.
For Nickel–cadmium batteries, the normal maintenance method is to conduct deep discharge regularly. In general, a deep discharge is performed once a month or after every 30 uses, discharging the battery to a voltage of 1.0V per battery unit (referred to as "exercise" by foreigners). In normal use, it is recommended to use photocells as much as possible or allow the battery to be turned off to alleviate the formation of memory effects. However, it should be noted that this situation does not belong to deep discharge, as ordinary devices (such as mobile phones) do not automatically shut down each battery cell when the battery voltage drops to 1.0V. The task of deep discharge must be completed through specific devices or circuits. Fortunately, many Nickel–metal hydride battery chargers have this function.
For the Nickel–cadmium battery that has not been exercised for a long time, due to the accumulation of memory effects, it is impossible to recover its capacity through exercise. At this point, a deeper level of discharge is required, which involves using a smaller current to discharge the battery for a longer period.
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