Q: The charging treasure that I purchased can theoretically give my smartphone full charge 5 times. I can't reach it every time. Has the capacity of charging treasures shrunk?
A: It is undeniable that charging Po is an amazing invention. Charging treasure is portable and cheap, and it can "rejuvenate" when the cell phone battery is about to run out. Charging treasures come in different shapes and sizes to meet the needs of various users. Some charging treasures are small and can be easily packed in pockets. When the battery capacity is only 2000-3000 mAh, some charging treasures are larger in size. Capacity can exceed 10000 mAh.
However, because most ordinary consumers do not have electrical engineering degrees, they often misunderstand the capacity of Charging. Many consumers believe that if a charging treasure has a capacity of 10,000 mAh, it can fully charge a smartphone with a battery capacity of 2000 mAh 5 times. Ideally this should be the case, but there are actually more factors that affect the number of charges.
To understand the real cause of the difference between the nominal capacity and the actual capacity of the charging Pod, we need to first understand the working principle of Charging Po.
Simply put, there are two necessary parts inside the charging treasure - the battery that stores the electricity and the circuit that controls the charging process. If a charging treasure has a nominal capacity of 10000 mAh, it means that the internal battery capacity is 10000 mAh, or the sum of the capacity of several batteries is 10000 mAh.
Lithium-ion batteries, such as smart phones and rechargeable batteries, have a nominal or average voltage of approximately 3.7 volts. The reason we use the word "average" here is that the battery voltage is not static. With the consumption of stored energy, the voltage will decrease; as the battery charges, the voltage will rise. If the voltage rises to about 4.3 volts, the modern smartphone battery is considered full; if the voltage drops to about 3 volts, the battery is considered empty.
Unfortunately, charging smart phones cannot directly use ever-changing voltages.
In order to charge a smart phone, the charger needs to output 5 volts instead of 3.7 volts. What are the reasons? Because the standard output voltage of the smartphone charger (or the computer's USB port) is 5 volts, it is also the "desired" voltage of the smartphone's internal charge control circuitry.
The circuit of the mobile phone can accurately control the voltage to 5 volts and then to the maximum voltage of the cell phone battery - about 4.3 volts. This seems a bit too complicated, but it is not.
Accurately controlling the charging process For safety reasons, the battery can explode if the input voltage is higher than the battery can withstand. Conversely, if the input voltage is lower than the design level, the battery may not be charged to its optimum state.
The charging treasure needs to raise the voltage of the internal battery to 5 volts. For this purpose, a special boost circuit is needed. However, the boosting circuit will consume some power. According to the efficiency of the boost circuit, the power loss may exceed 10%. In order to reduce the input voltage to a level that the battery can accept, smart phones also require a step-down circuit, which also causes power loss.
Another factor that must be taken into account is the charging speed of the Charging Pod - current assembly leads to reduced performance. In most cases, the user cannot do anything about this, because most charging treasures set the output current to 2 amps. There are also some charging amps with 1 amp output and 2 amps output current. Using 1 amp output current to charge the smartphone slower, but can output a few percent more power.
In addition, the battery does not like extreme temperatures. If the charging treasure is placed in a cold place or on the dashboard of a car under the sun, the battery power will be lost over time. Extremely low or extremely high temperatures may even cause permanent damage to the rechargeable battery.
Even if it is “being kindâ€, the charging battery power will be lost over time, which is caused by a phenomenon called self-discharge. Even if it is not used, a fully charged battery will be drained after several months. This is why it is a good habit to charge and discharge the charging treasure once a month.
The reason that the actual capacity of Charging Po is lower than the nominal capacity is that the nominal voltage of the battery at 3.7 volts must be raised to 5 volts, which will cause a 10% power loss. In addition, the actual capacity of the charging treasure is also affected by many factors, including ambient temperature, charging current, the health status of the charging treasure and the mobile phone battery, and the efficiency of the charging control circuit of the mobile phone.
In order to fully charge the smartphone battery, the nominal capacity of the charger should be 25%-30% higher than the smartphone battery.