Choosing an external battery (powerbank) for a smartphone, tablet, laptop | We advise, we share experience



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Powerbank - Selecting an external battery for your smartphone, tablet, laptop

Similar topics -Select the protected external battery PowerBank

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Mini FaQ
1. Manufacturers indicate the capacity of banks in accordance with the capacity of batteries installed in the device. This technique is generally accepted.
2. When assessing the capacity of a bank, losses must be taken into account. For example, for the most common use case of a bank for charging a device’s battery, the following losses occur:
- loss when converting from 3.7 V battery to 5 V output voltage in the bank;
- loss when converting from 5 V input voltage to 4.2 V charging voltage in the charged device;
- losses in the rechargeable battery.
Considering the efficiency of each section 0.9 we obtain the total efficiency of 0.9 * 0.9 * 0.9 = 0.73. This figure is approximate and depends on many reasons, in particular, the charge mode. The manufacturer does not specify this figure in principle - after all, 2 of the 3 stages are not underway, but in the load. And nowhere is it not stated that it is necessary to measure, taking into account the losses in the consumer - for example, if you connect the LED lamp to the panibribank - only the loss of conversion in 5 V, and, accordingly, the total efficiency will be 0.9, and even more.
3. Sometimes another value of capacity is written on the banks - capacity in terms of an output voltage of 5 V. Theoretically, this is more correct - after all, the device produces most often 5 V, but in practice it only causes confusion.
Firstly, because this figure is obtained by formal multiplication of the battery capacity by the voltage difference 3.7 / 5 = 0.74 without taking into account the efficiency, which can vary.
Secondly, the fact that the coefficient obtained is close to that obtained in Section 2 is nothing more than a coincidence, and the output voltage may not be 5 V ...
It is easier to explain with an example: Pipo and Cube tablets have batteries of the same capacity, but Cube charges from 5 V, and Pipo charges from 9 V (my bank gives 5, 9 and 12 volts).
So, when charging Pipo, the capacity of a bank must be multiplied by 3.7 / 9 = 0.41 and, accordingly, will the bank be enough for a smaller number of charges? No, 5 and 9 volts are just intermediate values, but energy is still described in item 2 - both at Cube and Pipo, the bank will provide the same number of charges (at Pipo, even slightly more - 9 V loss less)
4. All these figures are approximate - the parameters and conversion efficiency depend on the mode, and even when charging devices, the output capacity will be different depending on whether the tablet is charged with a 2A charge current or a phone with a 0.5A charge current. other devices - not the only use !!!
5. Unforgettable about the temperature mode of operation - from 0 to +40 РЎ0.
At low temperatures, even lower than 0 РЎ0, the battery self-discharge increases by several times, i.e. If you carry it in the cold in a bag, then at the most crucial moment you can get a discharged battery. Also, when cooled, the battery capacity and its life are very significantly reduced. If it is possible, do not freeze the battery !!!

Real capacity of banks.




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Topics Curatorslava_ussr

Post has been editedgabby - 15.11.20, 22:18
Reason for editing: reversed the words in the topic title



Rep: (2)
Is it possible to trust this seller? Xiaomi Power Bank 10000mAh with Silicone Czechol for $ 19 sells !!!http: //ru.aliexpress.c...Phone/32495464090.html



Rep: (444)
Forgot to tell T.
Recently came to mehere it isAsian Miracle ...
Metal case-kind as even the smallest of all that for 18650 are designed (less not happened, this one and so in the most bonding)
Looks good. From my three 18650 cans only alone, and then with pretimier labor got into this device (Sanyo 300)
It seems to work. I will then check the charge / discharge, because there are doubts.
By the way, the question surfaced. So in the countryside, electricity is often there and here jumps, these yusbishchny charging for gadgets quench the whole thing? Or preferably them too through the stabilizer to include?



Rep: (3109)
alexx1974 @ 02/25/2016, 10:10*
Hello everyone! I would like to receive advice from experienced users and owners of PowerBank.
In the family all Apple phones and tablets, good all cords with Lightning connectors, no confusion.
The question arose about purchasing an external battery with the Lightning connector.
The fact is that all Powerbanks that are present on the market have a microUSB connector and I will need to carry more cord everywhere for charging the battery itself.


If you love quests, I can recommend ChoetechB615Q. (The brand is gaining popularity in China, makes good glance). Already reserved at the Profile Chongdiantau with high estimates.

Inside the superscript circuit engineering and components, 4 coolest Panasonic NCR18650BF batteries of 3400 mAs (total 13600 mA В· h). 2 USB port ports. One of the output ports smart with the latest strapping FP6601 - can estimate the memory of Apple (2.4 A) and supports Qualcomm Quick Charge 2.0 (5/9/12 B). Micro-USB and Lightning for charging. The port for charging Lightning is also smart, it is captured by the Apple device and pumps everything from apple chargers. Micro-USB with Charging Support 9 V.

The real spanning energy is almost 40 W В· h (when the current with a voltage of 5 V) is discharged.

In general, the device is excellent by technical part. One of the best cans is now on the market (especially for the owners of Apple gadgets). But there is a quest ...

On Taobao, he is in the official store costs about $ 30. On Ali, only two sellers with fragile prices. You need to solve a small quest - find a seller who will sell this bank cheaper than $ 40.

There is a model with a capacity of 10400 mA В· hB612Q. . There is a model with a capacity of 15600 mA В· h B611q, but the body is plastic gloss. Internal fee without special differences between models.
A photo
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K
Added to the header


Post has been editedas16 - 25.03.16, 21:09
Reason for editing: Removed image under spoiler



Rep: (1)
Good evening. I got myself recently Xiaomi per 10,000, tell me how much it should be charged from 2a? And is it normal what he is heated during charging?



Rep: (3109)
BIILYA @ 02.26.2016, 00:59*
Good evening. I got myself recently Xiaomi per 10,000, tell me how much it should be charged from 2a? And is it normal what he is heated during charging?


With a high-quality memory, which can produce a current strength of 2.2 and with a voltage of 5.5 in full charge takes a little less than 4 hours. This battery pack (inside) is heated strongly while charging, especially about USB connector.



Rep: (3)
Have you met a good jar with a good flashlight?



Rep: (21)
Original Xiaomi 10000mAh

Who faced a breakdown of this bank? What to do?
Glow 4 light bulbs-does not give the charge phone. If you turn on the USB light bulb, then some time glows and swings. When charging was clicking, immediately removed. Prior to that, only 2 times charged-discharged. It burned 2 pcs of the adapter on 1 A. on the second just clicked.
Masters !!!! Ay? What to do? : Girl_Cray:


Response of the seller (or CService [email protected])

About Xiaomi Warranty policy, from the date of receipt, for example, a set of accessories and one for damage, seven days there is no reason to return, 15 days of replacement, one year warranty (Warranty: Customers under normal operating conditions due to the product itself causes no charge and discharge , convex, leaks and other unwanted situations give a guarantee of processing).

We can give you guarantees. We will help you send an element to the manufacturer for repair. Customers must pay the shipping cost when we received a defective product, the manufacturer. Technical staff will check the product problem if the product has problems due to physical damage and damage caused by improper use, you must pay for any costs incurred during the repair process. But if the problem is the cause of the product itself, they will repair it. If you need to pay for the repair of the board, we will inform you in advance. When the goods are renovated after checking the manufacturer, we will send it back to the client. Is it OK for you?



Rep: (1)
Good day to all!
Prompt this gadget Power Bank Xiaomi 16000 mAh for 900 rubles - is it a divorce?
Where does such charity come from? I called, they say, we say, we take so wholesale, so this is the price!
Toad does not allow passing by. And the mind says - fake.
What do you think?



Rep: (0)
Yesterday I took for 15 dollars Xiaomi Power Bank 10 000mA for shareshttp: //www.banggood.co...artphone-p-977406.html
After 11 o'clock he was already sent, surchated for the track number $ 1.6. Quite quickly, although I read some reviews what long come from them.
We will wait to see what will come out.



Rep: (2)
Good day.
Recently gave a portable charger, with Ali ordered, 80000mAh was written on the sticker. Is it really real?)



Rep: (3109)
jhdanov_96 @ 02.29.2016, 08:35*
Recently gave a portable charger, with Ali ordered, 80000mAh was written on the sticker. Is it really real?)


If it weighs about 1.5 kg and has the size of a liter package of juice, then quite.



Rep: (65)
Faced with a slow charge as its two-chempecker from the two-chamber Z.U. Smartphone, as well as with slowly charging a two-chemper smartphone from a double pottery.

For the weekend, it was measured, figured out the reasons and eliminated. It turns out that in almost all double chapels, a specially complete cable is extremely thin, limiting the charging current of the panibank at 0.5a.

This is due to the fact that the double pots are not equipped with double-digging z. In particular, stock z. Nokia, Philips, Lenovo, HTC 0.5A when connecting to double-chempecked smartphones and plug in thick (from the smartphone), the wire is issued (for a short time!) To 0.8-1.A, and Z.U 1A is issued to 1.5-1.7a. Accordingly, if it is thoughtlessly connect these near-suming z.u. To the chalktank with the entrance to 2a, z.u. Thin wire, plibank will be charged with a current of 0.5a and overload Z.U. will not happen . But on the thick two-chemper wire from the smartphone - Z.U. Issuance of abnormal current, it will be overloaded and after some time it can overcome.

Of course, the charging of the smartphone from the panibank is a thin wire also goes to 0.5a, which is enough for slow recharging, but not enough for recharging, and for active work, which was noticed me.

The measurements made on three (!) Affordable beliefs: Lenovo PB300, PB10600, Xiaomi 10,000 - in all input to 2a, all standard thin cable allowed only charging current to 0.5a.

Accordingly, now, every chalktank complied with a thick brand wire 20AWG (by the way, a couple remained, I can share) and charging current (both workers from the network and smartphone from the chalk) became stable 1.7-2.0

P.S. It is a pity that it is not written in one instruction on the panibank.

Post has been editedIzb - 29.02.16, 13:02



Rep: (4)
* Izb, I have now in the hands of Siaomi10400 and Yobao10200. Both manufacturers completed the devices by cables calmly holding 2a.



Rep: (65)
Nickola Krasnoyarsky @ 02/29/2016, 13:00*
IZB, I have now on the hands of Siaomi10400 and Yobao10200. Both manufacturers completed the devices by cables calmly holding 2a.


I wonder what the buyer will be made by these chambers, who has a smartphone with Z.U. per 1-1.3a (and the majority of such now) and which will carefully begin to recharge the powerful chain of such a relatively weak z. I tried a couple of such singleamine z.u. - Give a half amp, but how much will it work?



Rep: (444)
In general, I expelled my newfound Pavebank.
a photo
Attached ImageAttached Image
in comparison with 10000mAh Pavebank

Full suites for its modest price. 65r + 315r per can
Put inward 18650 at 3200makes
She charges at 2900, gives at 2200+ remnants for low-chamber charging (Smartsiki, BT headset)
Among the compact seems to be a good indicator.

Post has been editedd -_- b - 29.02.16, 13:22



Rep: (11)
IZB @ 02.29.2016, 12:01*
Of course, the charging of the smartphone from the panibank thin wire also goes to 0.5a

You have big problems with understanding how charging is charging. What is amperes, volts, etc.

If it is very brief (all your posts disassemble a little lazy):

0.5a you get one simple reason:

The consumer does not understand that it charges from the memory (chalk) and not from a USB company, and takes only 0.5a (standard for USB PC).

The reason for this behavior can be both in the memory and in the device itself. Read as devices define that they are connected to the memory, and not to PC, learn a lot of new things.

Most of the normal delibeors come complete with normal cables capable of missing 1a (all branded references Xiaomi 100% go with cables by passing 2A).

So the problem you do not have "thin cables". Please do not mislead forum users.



Rep: (14)
People advise PowerBank with the ability to charge through Lightning (Micro USB is also needed), by 5-6 ml \ h + -? The main essence does not carry a bunch of wires. That type is such a smaller volume and compact.http://www.aukey.com/p...ower-banks-power-banks.

Post has been editedoneBender - 01.03.16, 00:28



Rep: (12)
16000 Xiaomi arrived in 17 days. Original. It seems everything works.
I took the seller who was the first in the spoiler in the header.



Rep: (60)
Xiaomi Mi Powerbank 5000, pulled out of his pocket and saw that the first LED light was burning constantly. It does not charge and does not charge. Is it possible to restart him somehow?

Post has been editedvityok3000 - 01.03.16, 19:41



Rep: (18)
Hello everyone! Tell me what kind of new model came out from Xiaomi to 10,000? For some reason, the ZMI is called. The manufacturer decided to go to plastic cases?


Posted on 03/02/2016, 11:01:

Why zmi?
K
Please insert a working link to the goods!


Post has been editedas16 - 02.03.16, 12:48
Reason for editing: Tag


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