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: (3)
MS747 @ 02/23/2017, 00:20*
Advise a proven seller on Aliexpress which has Xiaomi Power Bank 2 10,000 Mah. Shenzhen Okqi Electronics Mall from the header disappears, there is no available. Rather, there is, but from Estonia and more expensive.

I know that it is about Ali asking, but I recommend to watch this PB on Banguda. Cheaper than all + Various coupons for add-storey there is on the Internet. Fakes were not sent earlier.



Rep: (240)
Allegg1965 @ 02.22.17, 22:12*
Bought today, the delibean PRODA V10I 20000mAh.

* allegg1965 You would have written the characteristics of your device to others not climb on the network in search.
Foundhere.
General characteristics
Capacity 20,000 maв‹…ch
Simultaneous charging two devices have
flashlight is
entrance
Micro USB connector
Voltage 5 B.
Current 1 A.
Output
Maximum current 2.1 A
USBX2 connectors
Maximum current on USB 1 2.1 A
Maximum current on USB 2 1 A
MICRO USB adapter
Battery
Type Li-Polymer
Additionally
Charge indicator is
Body Material Plastic
Sizes 65x139x21 mm
Weight 246 g
Complete set Cable for charging
If you believe this description, your device takes on the input of only 1A. From here everything is associated: charging stretching for a day and so on.
Such volume external batteries makes sense to buy if you use them from time to time. And if it is constantly for every day, then take such a jar only with the support of fast charging QC. And the corresponding charge with the same support.
And if you charge the smartphone with the on-screen and loaded processor, you need to be ready that the device simply may not have enough of the resource of your external battery.

20000mAh The battery supporting 2a must calmly charge the 2-ame charge device for the night. And to be sure which current gives your charger - you need to check the tester / multimer. Because the Chinese people are merry, and with optimism inherent with them, can indicate highly overestimated parameters.

All Russians with the holiday on February 23. Mature veterans My special congratulations!

Post has been editedBedovik - 23.02.17, 12:02
Reason for editing: Refinement



Rep: (1)
* Bedovik,
Thank!
For sure, the entrance to 1a, as I did not realize ... :(
I need a panibank for two purposes: 1) for the game (Sonya enough for a couple of hours with intensive use, and sometimes you want more); 2) as a backup battery for a metal detector.

Bedovik @ 02.23.17, 15:45*
And if you charge the smartphone with the on-screen and loaded processor, you need to be ready that the device simply may not have enough resource your external battery.

Well, the screen is not always fully enabled, the game has a charge saving mode. And the fact that the bodies do not increase the charge when recharging from worrying in playing mode, I understand it. But it is strange that the chalktank sits down when the game is faster than the battery Sonya. Over two hours 40% of the 20,000, even if 12-15,000 (which is more real) - it seems to me that it is a lot. Sonya (3000 mAh) in the same mode loses no more than 20-30% of the charge.
Today I will try to charge anything in sleep mode (smart with a display turned off, metal detector), let's see.

But, most likely, I will try to change in the store on Xiaomi Mi Power Bank 20000. Judging by the characteristics, there is 2a input.

Happy Holidays !!!!



Rep: (34)
Allegg1965 @ 02.23.17, 14:51*
Over two hours 40% of the 20,000, even if 12-15,000 (which is more real) - it seems to me that it is a lot.

Most likely in this beliefs much less than 20,000 mAh.
The Xiaomi Mi Power Bank 20,000 is guaranteed to 20,000 mAh, and on the Quick CHARGE 2.0 input, it will be charged from QUICK CHARGE 2.0 charging with support to Quick Charge 2.0 will be charged for 6-7 hours.



Rep: (4)
Where can I order Xiaomi 20K of the first version? On Banguda Sold Out.
Vinsic only the Terminator is a good thing? Or other Alien variants and some more too good?
Aykey - shop in recommended, but no model in proven banks. Do not have to watch?



Rep: (1859)
indee @ 02.24.2017, 10:53*
Where can I order Xiaomi 20K of the first version?

And what is the meaning of buying an old version?



Rep: (4)
Vintal2002 @ 02.24.17, 12:40*
And what is the meaning of buying an old version?

QC for the output I do not need and do not plan to be needed.



Rep: (264)
indee @ 02.24.17, 15:47*
QC for the output I do not need and do not plan to be needed.

And charging with small currents?



Rep: (1859)
* indee
And how much do you plan to save due to the lack of this function, one hundred rubles or two hundred? I am no longer saying that you can run on the fake, and the new one has not yet managed to clone, but of course yours.



Rep: (1)
Perhaps not quite on the topic, but still, my smart supports QC 2.0, I choose Power Bank, as you are very much, I'm missing for a day, now Dilloma take Power Bank with QC? Or ordinary, recently heard the opinion from one auto electrician that if quickly battery is charged with a strong current, then it develops faster, but there are car akums, but he also has a smart with QC and he always charges it slow current, who will say what will say on this score how much Does this have the right to life? Or is it nonsense?

Post has been editedyuraskaz - 24.02.17, 15:13



Rep: (4)
* The mysterious
* vintal2002,
Dear, I don't need to persuade me - I wrote that I needed, and why and why - this is me to decide.

I repeat the second part of the question for others
indee @ 02.24.17, 10:53*
Vinsic only the Terminator is a good thing? Or other Alien variants and some more too good?
Aykey - shop in recommended, but no model in proven banks. Do not have to watch?



Rep: (264)
* indee
Actually wrote about "Small Toki" for everyone, suddenly you did not know. And if you are so independent - your hands on your feet and look for yourself. Good luck.



Rep: (527)
* indee
Aukey Normal Firm, you can take if I liked what model.

Post has been editedAVATARA122 - 25.02.17, 12:19



Rep: (106)
indee @ 02.24.17, 09:53*
Aykey.

Aukey firm is excellent, all cable I have this brand. They have banks compared to others, from a technical point of view a little behind competitors. Only on some there is a QC, and often they are heavier by weight.



Rep: (34)
Themysterious @ 02/24/17, 17:54*
And charging with small currents?


Be kind, tell me why it is needed, what options for its use and for which devices?



Rep: (264)
Kengoo1978 @ 25.02.2017, 15:11*
...

Be kind, tell me why it is needed, what options for its use and for which devices?

To charge devices that consume a small amount of current. For example, Miband or Bluetooth headset. Not all verbanks can charge such gadgets, as they do not recognize them and disconnect the charge after a short time.



Rep: (34)
Themysterious @ 25.02.17, 18:52*
Since they do not recognize them and disconnect the charging after a short time.

Is this automatically turn on this function? Or is it necessary (or even you can) include yourself?

Guys, someone took Pineneng Bank in a new building and with a new screen? Looks very pretty! Waiting for QC from themscoreand more aboutQC.

Post has been editedkengoo1978 - 25.02.17, 18:48
Reason for editing: QC



Rep: (264)
Kengoo1978 @ 25.02.17, 18:30*
Is this automatically turn on this function? Or is it necessary (or even you can) include yourself?

To turn on, you need to quickly press the button twice. (When the mode is active - each LED is blinking in turn). To disable, you need to press and hold the same button.



Rep: (264)
In general, I ordered at the beginning of the monthXiaomi PowerBank 10000 Pro (PLM01ZM) . Choose between it and new to 20,000 with QC3.0. As a result, the size and presence of Type-C from 10,000 took up. He cost me more expensive to me, since only one seller sends to my country (Georgia).
Today I took from the post office, I reveal and see that on the box a picture of the device (and all this model was simply with the inscription MI without any image). I thought already that the seller mistakenly sent me Powerbank 2 per 10,000. It turned out that this one, slightly updated modelPLM03ZM (here it is also called Pro 2), which supports QC3.0 (in the previous QC2.0). Also, she has a new cord (not noodles, as it was before), the adapter on Type-C has been attached to the cable and no longer a separate component, as on PLM01ZM - convenient. The bank was charged to 25% (only one LED blinked). Put for charging (zoom - CHOETECH QC3.0. ) And for 3 hours I completely gained charging. As a result, it is extremely pleased with the choice, even a little overpayed, but he beat off the cachek + bonus received a more recent model. The QC at the exit was not very interested, since the phone is Nexus 6p, and he has its own free charging technology, but the QC itself is the thing - the thing is useful (before that there was a fat man Xiaomi per 10,000), almost 6 hours were charged. The site struck the code - the original.

Took here:clack
But I do not advise you to take residents of the Russian Federation, since they are so many sentences for them and at more delicious prices. But who, like me, the choice is limited - I recommend buying just this seller and do not think, everything has reliably and quickly. By the way, before buying the bank, I wrote to him to find out whether there is a version of 10,000 Pro with QC3.0, said there is no such thing, and in the end I sent this exactly. I do not know, the coincidence or not, maybe Xiaomi is already only PLM03ZM released.
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Post has been editedThemysterious - 01.03.17, 12:36



Rep: (6)
Sparx11 @ 7.02.17, 19:32*
Hello everyone. Tell me, I liked Romoss Sense 15, but for some reason it confuses its valuehttps: //ru.aliexpress....14.12010612.0.0.gfcsi1
Is this bank original? Who uses this, is good? Worth take?

In general, this bank came, discharged it and put it for the night to charge, as a result, somewhere in 8 hours I was completely charged in the photo. It can be seen how much closed - 13300. Charged 1.6 and how and gave it to REDMI 3 and 4, not bad, But off. Information never found on it.
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Post has been editedSparx11 - 26.02.17, 12:44


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