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[Editor's note] I have also thought about why mobile phone batteries charge more slowly, and even suspect that it is my own psychological effect. But in fact, there seems to be a certain reason. Let's take a look at the English language in this regard.
Why does it take longer for mobile batteries to charge after 70-80%?
【Translation】Why does it take longer to charge a mobile phone battery after 70-80%?
[Words] mobile ['moh-buh l]['məʊbaɪl] adj. mobile; changeable; active
[Word] batteries Prototype: battery ['bat-uh-ree]['bætərɪ] n. battery
While the batteries nowadays charge from 0 to 50 in like 5 to 10 minutes, it almost takes twice as long to charge from that point to 100%.
[Translation] Although the battery now takes only 5 to 10 minutes to charge from 0 to 50, it will take almost twice as long to charge to 100% afterwards.
[Word] nowadays ['nou-uh-deyz]['naʊədeɪz] adv. nowadays; now, equivalent to "at this time"
【Word】twice adverb [twahys][twaɪs] adv. twice; twice
Why?
[Translation] Why?
Imagine you're going to a cinema.
【例句】Imagine you go to a movie theater to watch a movie.
[Word] imagine [ih-'maj-in][ɪ'mædʒɪn] vt. imagine; imagine; imagine; guess; think; think vi. imagine
【Words】cinema noun ['sin-uh-muh]['sɪnəmə] n. movie theater; movie
You are first to enter the showing room and all the seats are empty.
【译】You are the first person to enter the exhibition hall, all the seats are empty.
[Word] the original form of enter ['en-ter]['entə] v. Enter
[Word] seats prototype: seat noun plural form [seet][siːt] n. seat; seat
【Word】empty ['emp-tee]['empti] adj. empty
You can easily find a seat to sit down.
【例句】You can easily find a seat to sit down.
When more and more people come and sit down there are less seats and it takes longer to find one and get to it.
【Translation】As more and more people come to sit down, there will be fewer and fewer seats, and it will take longer to find one to sit on.
[Phrase] more and more more and more; Example: Now more and more people are streaming into big cities. Now more and more people are streaming into big cities.
For explainational purposes phones are similar that it takes longer for the ions to find a place in the battery when charging when it is close to full.
[Translation] For the purpose of explanation, the mobile phone is similar. When the battery is close to full charge, the ions in the battery take longer to find the position.
[Word] Purposes Prototype: purpose ['pur-puhs]['pɜːpəs] n. purpose; determination; intention
[Word] phones Prototype: phone [fohn][fəʊn] n. telephone; telephone
[Word] ions Prototype: ion plural form of noun ['ahy-uhn,'ahy-on]['aɪən] n. ions
First of all the energy % level is hard to actually measure for most batteries, and your phone estimates how full it really is.
First of all, for most batteries, the energy percentage level is difficult to actually measure. Your phone will use an estimate to estimate how full it is.
[Word] measure ['mezh-er]['meʒə] v. measure; compare; give; weigh
【Words】estimates Prototype: estimate ['es-tuh-meyt]['estɪmət] v. estimate; estimate; evaluate
How this estimation is done makes a big difference for this.
[Translation] How to estimate has a big impact on this.
【Words】estimation [es-tuh-'mey-shuhn][ˌestɪ'meɪʃn] n. judgment; estimation
Also the fuller a battery is the harder it gets to fill it further because less material to react is left, and the "force to decharge it" gets stronger.
[Translation] In addition, the more the battery is full, the more difficult it is to recharge the battery, because the less reactive substances left, the stronger the "recharge power".
【Word】fill verb original form [fil][fɪl] vt. To fill; diffuse; fill; serve
[Word] the original form of the react verb [ree-'akt][ri'ækt] v. reaction; counterattack
[Word] decharge ['detʃɑːdʒ] here refers to the power that makes the battery more difficult to charge
It's mostly due to the software of the charging system.
[Translation] This is mainly due to the software that controls the charging system.
【Phrase】due to mostly means "because; because". Such as: This accident was due to his careless driving. At the same time, due and to are singly matched, and can also mean "pay to someone", such as: Respect is due to older people.
【Word】mostly adverb ['mohst-lee]['məʊstli] adv. mainly; usually
They go at a higher voltage for the initial part and slow down to prevent damage during the final stages.
[Translation] They (the voltage used for charging) have a higher voltage in the initial stage and slow down in the final stage to prevent damage.
[Word] voltage noun ['vohl-tij]['vəʊltɪdʒ] n. voltage
[Word] initial [ih-'nish-uhl][ɪ'nɪʃl] adj. beginning; initial
[Word] prevent the original form of the verb [pri-'vent][prɪ'vent] v. prevent; prevent, prevent; block
【Word】damage noun ['dam-ij]['dæmɪdʒ] n. damage; loss; destruction
Electricity has 2 basic properties, voltage (electrical "pressure") and current (electrical "flow").
[Translation] Electricity has two basic properties, voltage (the "pressure" of electricity) and current (the "flow" of electricity).
【Words】electricity [ih-lek-'tris-i-tee][ɪˌlek'trɪsəti] n. Electricity; Electricity; Current
[Word] electrical adjective [ih-'lek-tri-kuh l][ɪ'lektrɪkl] adj. electrical; related to electricity
[Word] flow noun [floh][fləʊ] n. flow; flow; flow
To force current into a battery to charge it, you need to apply a higher voltage than the battery already has in it.
[Translation] In order to force current into the battery to charge, you need to apply a higher voltage than the battery itself.
[Word] the original form of apply verb [uh-'plahy][ə'plaɪ] vt. apply, use
Otherwise electricity would want to flow from the battery into the charger, or at least stop flowing, and neither of those is helpful.
[Translation] Otherwise, current will flow from the battery to the charger, or at least stop flowing, and neither of these makes sense.
【Word】otherwise ['uhth-er-wahyz]['ʌðəwaɪz] adv. otherwise; differently; in different ways
【Word】charger noun ['chahr-jer]['tʃɑːdʒə] n. charger
【Word】neither ['nee-th er,'nahy-]['naɪðə] pron. Neither
[Word] helpful adjective ['help-fuhl]['helpfl] adj. helpful; useful
But when the battery is near the maximum voltage it can safely be exposed to... the amount of voltage you can use to force current into it is just a tiny bit higher than its current voltage, and the flow of electricity into it gets very slow.
[Translation] But when the battery is close to the maximum voltage it can safely carry, the voltage you can use to force current into the battery is only a little bit higher than the current voltage of the battery, so the current flowing into it will be very slow.
[Word] maximum ['mak-suh-muhm]['mæksɪməm] adj. the highest; the maximum limit
【Word】safely adverb [seyf]['seɪfli] adv. safely; steadily; surely; without risk
[Word] exposed Prototype: expose [ik-'spohz][ɪk'spəʊz] vt. expose; expose; expose; expose
【Words】tiny ['tahy-nee]['taɪni] adj. tiny; tiny
If you fill a glass with water you first puor very fast but at the end you start slowing down because you don't want to spill any water.
[Translation] If you are going to fill the glass with water, you will pour very quickly at first, but in the end you will slow down because you don't want to spill the water.
【Words】glass [glas, glahs][ɡlɑːs] n. glass; glass; glass products
【Words】spill noun [spil][spɪl] v. overflow; sprinkle; make... flow out; leak n. overflow; flow; wood chip; small rod
The same goes for batteries.
[Translation] The same is true for batteries.
[Editor's note] Finally, share your mobile phone charging experience with friendship. With the current new battery technology, the mobile phone battery can be charged at any time without having to wait until it is almost used.