At present, the better rechargeable AAA Ni-MH dry battery has a capacity of about 950mAh. To ensure the battery life of a smartphone for one day, at least two or three AAA batteries are connected in series. Moreover, in order to increase the volume of the dry battery, it is designed as a larger cylinder, which takes up more space than the cubic lithium-ion battery. In other words, dry batteries with the same capacity are larger than lithium-ion batteries, which is obviously not suitable for smart phones with highly integrated internal space and an inch of gold.

Furthermore, even if three high-performance Ni-MH dry batteries are connected in series, the voltage obtained will not exceed 3.6V (the voltage of a Ni-MH battery is only 1.2V), while the voltage of lithium-ion batteries commonly used in smartphones is generally 3.7V To 4.2V. Moreover, the series connection of dry batteries will cause unbalanced discharge due to slight differences in voltage, resistance, and capacity. Insufficient voltage and instability mean that smart phones cannot use high-performance hardware, which is unwilling to see many mobile phone enthusiasts who pursue excellent performance.

The most important point is that the rechargeable Ni-MH dry battery has a memory effect, and its power must be exhausted every time it is charged. The general charging time exceeds 8 hours, which is very inconvenient to use. The lithium-ion battery has no memory effect and can be charged at any time, and the charging time can basically be controlled within 2 hours, which is far more practical than dry batteries.