What is a battery cell?
The battery cell of the charging treasure is a set of storage batteries. There are two main types of batteries used in the charging treasure currently on the market, one is 18650 lithium-ion batteries, and the other is lithium polymer batteries. The two are easy to distinguish in appearance, the 18650 cell is cylindrical, and the lithium polymer cell.
18650 cells have the advantages of mature technology, wide range of applications, and small size. However, the cycle life is about 300 times, the safety performance is low, and the overcharge resistance is poor, so it is not suitable for high rate charge and discharge.
Lithium polymer batteries have the advantages of diverse volumes, a wide range of applications, not easy to explode, and high safety factor, but they are expensive, pollute the environment after being discarded, and have weak high-current charging and discharging performance.
What is conversion rate?
Before talking about the conversion rate, we must first understand what is the capacity of the power bank? What is the rated capacity of the power bank?
The capacity of the power bank is the capacity that the power bank can store, and the rated capacity is the capacity that the power bank can output to the device. The conversion rate is the ratio of the rated capacity to the capacity of the power bank.
For example: the capacity of the power bank is 10000 mAh, and the rated capacity of the power bank is 9000 mAh, then the rated capacity of the power bank is divided by the capacity of the power bank, which is 9000 mAh, multiplied by 100%, and the result is 90%.
The conversion rate can reflect the actual output capacity of the power bank to the device, and the loss of the power bank during storage and charging. The higher the conversion rate, the better the power bank.
What is two-way fast charging?
Two-way fast charging means that the power bank can not only quickly charge your mobile phone, tablet and other devices, but also support fast charging of the power bank. The power bank charges your mobile phone with fast charge output, and the charger is used to charge the power bank with fast charge input, so it is called “two-way”.
What fast charging agreements are there?
1. PD fast charging protocol, full name “USB Power Delivery” power transmission protocol. There are currently three main versions of the PD protocol, PD1.0, PD2.0, and PD3.0. The latest PD 3.0 protocol supports Qualcomm’s QC fast charging protocol. All chargers that support the USB-PD protocol must be Type-C output. (Type-C is the kind that can be plugged into the front and back of the phone)
2. Qualcomm QC fast charging: In 2013, Qualcomm released the QC1 protocol, and then experienced QC 2, QC 3, QC 4, and QC 4 + versions. On July 28 this year, Qualcomm announced the launch of a charging power up to 100W. QC5, and further compatible with PD.
3. MediaTek PE fast charge: Full name: MTP Pump Express Plus The latest is the PE3.0 protocol launched in 2016, with a maximum charging power of 34.8w, which is relatively seldom used in the market.
4. Private fast charging protocols of mobile phone manufacturers: OPPO’s VOOC flash charging, Super VOOC super flash charging technology, vivo’s FlashCharge, OnePlus’ Dash, Huawei’s FCP and SCP, and Xiaomi’s ChargeTurbo. Charger and data cable.
The PD fast charging protocol covers the previous proprietary protocols of Qualcomm, MTK, Huawei, and OPPO. Its popularity is the best among many fast charging protocols, but it should be noted that the PD fast charging protocol must use Type-C output .
What are the common problems and misunderstandings in purchasing charging treasures?1. How old is the charging treasure that cannot be carried on the plane?
For individuals, there is no need to worry about bringing the power bank on the plane with a power bank below 20,000 mAh. Because according to regulations, the rated energy value of lithium-ion batteries must not exceed 100Wh, and those exceeding 100Wh but not exceeding 160Wh can be loaded on equipment in checked luggage or hand luggage after approval by the airline. Lithium batteries exceeding 160Wh are strictly prohibited.
2. Can I use the data cable that comes with the phone for fast charging?
Whether you can use the data cable that comes with the mobile phone for fast charging depends on the situation of the mobile phone. Basically, it supports the use of the data cable that comes with the mobile phone to connect to the power bank for fast charging. In particular, it should be noted that many data cables purchased online do not support fast charging.
3. Does the power bank fast charge support your mobile phone?
Whether your mobile phone can be fast charged with a power bank, you need to know the type of fast charging protocol for your mobile phone, and then compare it with the fast charging protocol supported by the power bank. If you support it, you can support the fast charging protocol of your mobile phone. Which protocols are supported, Baidu search should be able to find many answers, most mobile phones currently support the PD fast charging protocol.
4. The large capacity of the power bank does not mean that the mobile phone can be charged several times.
The large capacity of the power bank does not mean that the same mobile phone will be fully charged more times, because it also involves the conversion rate of the power bank. Power banks will lose power when storing power and charging. Some low-quality power banks have a very low conversion rate. Remember to check the rated power of the power bank when purchasing.
Pay attention to the charging cable interface (PD protocol) for fast charging and charging treasures
When buying a charging treasure with PD protocol, you must remember to buy a Type-C data cable, that is, the part connected to the charging head is the one that is plugged in front and back. Both ends of the line that supports the PD protocol for Android should be plugged in front and back. kind.
What should I pay attention to when purchasing a power bank?1. The capacity and rated capacity of the power bank
I have already described the difference between the capacity of the power bank and the rated capacity in the first half of the article. The power bank capacity is the capacity that the power bank can store.
But in fact, it is not possible to charge so much capacity when charging mobile phones and tablets, because the storage process of the power bank will be lost, and it will also be lost when charging the mobile phone.
The rated capacity is the actual output capacity of the power bank, so we should pay attention to the rated capacity of the power bank when purchasing a power bank.
2. Power bank size and weight
When will we use the charging treasure? Of course, when we go out to play, or go out with friends, so the portability of the power bank should be the first thing we should consider.
When you go out to play, you need to carry all kinds of things, such as electronic products, clothes, toiletries, etc. These are not heavy individually, but they add up to be very heavy.
Therefore, on the basis of safety, the first thing we need to consider is its portability, small appearance, and light weight. Otherwise, a power bank like a brick will not only take up a lot of space, but also be heavy.
3. The fast charging protocol supported by the power bank
At present, the popular fast charging protocols on the market are mainly the PD protocol, Qualcomm’s QC protocol, and the private protocols of various mobile phone manufacturers, such as OPPO’s VOOC flash charging and SuperVOOC super flash charging technology.
Before buying a power bank, you should check whether the power bank supports the fast charging protocol of your mobile phone. Many power banks are compatible with multiple fast charging protocols at the same time, but the maximum charging power of each protocol is different, so you need to pay attention when purchasing.
4. Power bank charging speed
The charging speed of the power bank is mainly limited by the charging power and the material of the data cable. As mentioned above in the power bank, let’s talk about the problem of the mobile phone data cable.
The data cables on the market are still quite complicated. There are Type-A and Type-C interfaces, and there are differences in data transmission standards. Some data cables can only charge, but cannot transmit data!
This part will take a long time to talk about. My suggestion is to go to the official website to buy the official data cable, and then ask whether it supports fast charging, data transmission protocol, etc. when purchasing from other merchants.
5. Charging treasure interface, type and quantity
There are three main interfaces of power bank, Type A interface, Type C interface and Apple’s Lightining interface.
What are the benefits of a charging treasure that supports these three interfaces? Simply put, no matter what mobile phone you use, you only need to bring a data cable when you go out to charge your mobile phone and power bank.
Currently there is a [dual-mode smart super charger], which is both a power bank and a charger. Generally, there are two to three interfaces, which can charge multiple devices at the same time. You only need to bring a data cable when you go out, and you don’t even need to bring a charging head.
