The standard No. 7 dry battery can reach 11mm in diameter, while the thickness of current smart phones is only about 7mm, and the body of more than 10mm will appear thick. In addition to the battery compartment, the inside of the phone also needs to contain the motherboard and the screen. That is to say, if you use a No. 7 dry battery, the thickness of the phone must be at least 15mm, which is almost twice the thickness of the current iphone8. I believe no one would be willing to go out with such a thick mobile phone.
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The capacity of dry batteries is also a big problem. For example, the above-mentioned philips can only maintain a talk time of 3 hours using a dry battery, which is obviously not enough. At present, the capacity of the better rechargeable No. 7 nickel-metal hydride battery is usually around 950mAh. To ensure the battery life of a smartphone, at least two to three No. 7 batteries must be connected in series. In addition, in order to increase the maximum volume, the dry battery is designed as a larger cylinder, which takes up more space than the cubic lithium battery. In other words, dry batteries of the same capacity are larger than lithium batteries, which is obviously not suitable for smartphones with a highly integrated internal space and "inch soil".
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Even if three high-performance nickel-metal hydride batteries are connected in series, the voltage obtained will not exceed 3.6V (the voltage of a nickel-metal hydride battery is only 1.2V), and the general lithium battery voltage of smart phones is generally between 3.7V and 4.2V between. Moreover, the series connection of dry batteries will cause uneven discharge due to subtle differences in voltage, resistance, and capacity. The lack of voltage and instability mean that smartphones cannot use high-performance hardware, which is something that many mobile phone enthusiasts who are pursuing excellent performance are unwilling to see.
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The most important point is that there is a "memory effect" for rechargeable NiMH dry batteries. Each charge must be exhausted. The general charging time is more than 8 hours, which is very inconvenient to use. The lithium battery has no memory effect and can be recharged at any time. The charging time can basically be controlled within 2 hours, and its practicality is far more than that of dry batteries.
Although dry batteries are cheaper than lithium batteries, no matter from the point of view of product manufacturing cost or ease of use, dry batteries have no advantage over lithium batteries, so mobile phones use lithium batteries instead of dry batteries.
The dry battery also becomes a voltaic battery, which means that multiple sets of round plates appear in pairs and are stacked in a certain order. There are two different metal plates on the round plate, and there is a layer of cloth between the layers to conduct electricity. The dry battery is made according to this principle. There is a paste-like substance inside the dry battery, some of which is gelatin. Therefore, its electrolyte is paste-like, and this kind of battery disposable battery cannot be recharged after being discharged. The electromotive force of the zinc-manganese dry battery is 1.5V. If you charge the mobile phone, at least multiple dry batteries are required.
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