Many people may be surprised by this, but the reason stems from the smartphone itself.
The battery is not like a can of gasoline, which means that the phone will not be able to measure the amount of fuel or energy in the battery. Like other battery-powered electronic devices, the only thing a mobile phone can do is to estimate the battery life and measure the energy used since the last battery charge.
For a better understanding, let us understand how to calculate the percentage of cell phone battery capacity. For example, a mobile phone can track the battery power that the user has used since the last full charge and subtract it from the last capacity value of the battery. However, the current capacity value is also an estimate based on past usage. If the battery is never completely depleted, it will be difficult for the phone to know how long it will take to fully charge, so it is even more difficult to estimate.
One simple reason that 1% can last for a long time is that mobile phones underestimate the current battery capacity. Therefore, when the user thinks that the battery is almost used up (1%), but the actual battery capacity is larger than the phone’s estimate.
Basically, because it is difficult to give an estimate, the designer of the software algorithm believes that it is best to first evaluate the maximum value that the battery can consume, and then get the lowest result. In order to prevent the phone from running out of battery power suddenly. Or to be more precise, the battery may actually have 5%, but the calculation algorithm is only 1%, which can help people prepare before the battery is really exhausted, such as backing up data or finding a charger to charge. Toll. Toll.
In fact, the algorithms used to estimate capacity and current usage are complex and even vary by battery model and manufacturer. In addition, factors such as temperature will also affect the measurement. If the user wants to improve the estimation, at least temporarily, for the smartphone measurement algorithm, the user needs to perform a complete charge/discharge cycle. This means that the device is charged to 100% and then used until it is turned off (0%).