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> Choosing an external battery (powerbank) for a smartphone, tablet, laptop | We advise, we share experience
as16
Message#1
27.01.15, 18:14
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Meizu M2 Note

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Choosing an external battery (powerbank) for a smartphone, tablet, laptop

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A few tips before buying
Buy only original devices,
Get information about the device on the Internet,
Inspect the battery externally for defects,
If you buy abroad (Aliexpress, Ebay) read reviews
List of verified sellers
How to check the device for authenticity
Xiaomi
The verification code is under the sticker on the box, erased with a coin!!!
Authentication with regular captcha
How to check originality, if on the official site captcha with hieroglyphs
Reviews and Unpacking
Useful

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 of 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 cannot fundamentally indicate this number - in fact, 2 of the 3 stages are not held in a crib, but in a load. And nowhere is it indicated that it is necessary to measure taking into account losses in the consumer - for example, if you connect an LED lamp to the bank - only the conversion loss of 5 V will remain, and, accordingly, the total efficiency will be 0.9 or 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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The cap is in the process of replenishment.

Post has been editedslava_ussr - 23.04.19, 19:17
Reason for editing: Test review of the VQ8 KIT Power Bank at 8x18650 PD3.0 QC3.0
quoter-qq
Message#2
20.03.13, 18:04
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Meizu MX2

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9 hours flight and 6 hours transfer - one way. all this time to sleep or stupidly get drunk is not an option, you have to feed the smartphone with something, so as not to die of boredom or kill the cog

I myself have:Meizu MX2 - Discussion, my wife has an iPhone 4s. The choice of batteries is enormous - my eyes diverge, but I really don't want to buy a cat in a bag. You need a capacious and inexpensive battery with outputs for iPhone and micro-USB, about 8000 mAh and not beyond the price - 2000-2500 maximum. and I want advice from those who actually used the device, because it began to be sold by a lot of completely unknown firms, or firms that do not cause any trust at all - all sorts of trash Russian office re-branded companies with multiple wrap

Order on ibee or dx is not considered, no time to wait for delivery. you need to choose from those sold in Moscow stores

in * accessories * everything is only for specific phone models and there is no general statistics (((
googled, went to search, but found nothing specific in one topic

Post has been editedas16 - 27.01.15, 15:56
Shoore
Message#3
20.03.13, 19:29
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M
The topic has been moved to the "Selection and Comparison" section.
vladlat59
Message#4
20.03.13, 21:58
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You can ask here.Orhere

Post has been editedvladlat59 - 20.03.13, 22:00


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HP iPAQ214 + SDHC (Apacer class 6 8GB + Kingston class 4 16GB + 32GB (Transcend class 6 + Patriot class 10 (LX + LX PRo)) + CF A-Data 16GB + Denon AH-C452 + Sennheiser CX6 Travel (They were: Sennheiser CX300, CX300-II, CX400-II)
rzfox
Message#5
07.04.13, 13:20
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Any powerbak with 5V \ 1A fits perfectly, what is there to think
Airobot
Message#6
25.04.13, 09:49
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Topikstarter is no longer needed, but maybe someone else will come in handy. :)

See brands of famous factories - Pineng, Yoobao, for example.
I once bought a noname, it was enough for two times, the third battery no longer gave a charge. Disassembled - in banks there is a charge, so the problem is in electronics.

Now I use Pineng for 5000 mAh, enough for almost two full charges of the phone, or for +3 hours of tablet 7 operation. "
quoter-qq
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25.04.13, 10:06
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Meizu MX2

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right, I do not need)))

A very long and tedious road, as well as a vacation itself - a dicom battery was tested for 11,000
http://dicom.su/ru/cat/mn-zaryadnye-ustroj...id-189/ids-847/

two outputs at 0.8A
one output at 2A, charges the bodies a little faster
The ACC itself takes a very long time to charge, but it's worth it, it charges my mx2 4-5 times, the self-discharge is very, very low
weighs little, dimensions are also small. I liked this business so much that I just carry it with me in my bag just in case
deficiencies and problems not found - I highly recommend

bought in player.ru if that matters
It does not have its own bulky power supply, as with some similar batteries, and it charges from your computer or from tiny charges with a USB output, such as Samsung, which is a big plus. I did not use native adapters, I just took two cords with me - a mini-usb and an iPhone
Sultan_SPb
Message#8
26.04.13, 15:56
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We don't have a PionEra in St. Petersburg, as far as I know, it is not available in the market. It is a pity, I would have bought it myself, on vacation is not a replaceable thing, during excursions you are not soaring with the search for sockets!


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Rocky_nsk
Message#9
04.05.13, 20:57
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Looked at the price tag on the above dicom. Khmmm, 3000 rubles. for the device - somehow expensive. Perhaps, I will order from Ebay. I think that a quality device with no less capacity is possible for 2000 rub. buy + free shipping. IMHO.


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Samsung R210S ->Samsung X100 ->Nokia 6230 ->Nokia N73 ->Nokia N82 ->LG P500 ->Meizu MX2 ->Huawei Honor 8
quoter-qq
Message#10
08.05.13, 11:03
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Rocky_nsk @ 05/04/2013, 21:57*
I looked at the price tag on the above dicom

one should understand that buying in offline retail is always more expensive, but there is an opportunity to touch the device, check everything with your own eyes. I had to buy an acc for a week before leaving for a vacation - ibey and alibaba were immediately excluded
and .. I have long ceased to believe in good and cheap China. if something Chinese is cheaper than other Chinese, then it is really worse than that, there can be no miracle here. twice cheaper - it means 2-10 times worse
quoter-qq
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17.05.13, 10:59
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Meizu MX2

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but what you can buy in China, instead of * honest * device

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* .ps - this is sand, if that)))
yorsh48
Message#12
17.05.13, 11:24
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Yuzayu already a year energizer XP4001, meizu mx2 enough to charge twice.
Sultan_SPb
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17.05.13, 13:00
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quoter-qq,fun grass? :)


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F-light
Message#14
20.05.13, 06:45
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I bought myself a Vertex 5200 mah, the price is 2200 rubles. I think it justifies itself, as the manufacturer is famous, besides a guarantee from Kay.

http://vertex-digital.ru/produkciya/akkumu...tralife/#:tab-1
Multisoft
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22.05.13, 00:47
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Zopo ZP998

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I ordered myself such a thing of golden color $ 9.58
Screenshot (Click to view) Picture
Model: S-C-0006
Package size: 160 x 110 x 45 mm
Input: DC5.0V, 500MA
Output: DC5.5V, 800MA
Built-in lithium battery 2600mAh / h

Solar energy charging time for built-in battery: 8-12 hours
Charger: 6-8 hours
Charging time for mobile phones: about 60 minutes (depending on different brands and models may vary slightly)

Included:
1 x Solar Charger
5 x adapter
1 x charger
1 x data cable

And that's what came:
Screenshot 1Picture
Screenshot 2Picture
Screenshot 3Picture
Screenshot 4Picture

As a result: the phone charged 2% further the phone began to discharge.
The device itself was not charged from the sun within a day. Although the LED was green.
I decided to disassemble and solder another battery.
That's what happenedPicture
Now the device charges the phone by 25%. Not ice, but better than nothing.

Post has been editedMultisoft - 23.05.13, 00:15
vo_vas
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27.05.13, 23:44
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Decided to pick up an external Akum.
I looked for Ali - and now I was a little at a loss ...
10 000-30 000 ma - is this all real ???
eghere- like a bunch of orders - "5-star" responses, the price is 18 bucks: shok:: shok:: shok:
Who used "small" type batteriesthis
2600 ma - 5-6 bucks. Do they have enough for 1 smart charge?

Post has been editedvo_vas - 27.05.13, 23:50


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Lenovo a660>>ZTE v967s>>ZTE Nubia M2
quoter-qq
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28.05.13, 07:53
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There is no miracle for a penny, the examples above confirm this. from 8000 to 12000 is about 75-100 bucks. It seems expensive, but it is the price for an "honest" capacity.
vo_vas
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28.05.13, 15:49
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I found an interesting review about buying a 20,000 ma battery (wholesale 50 pcs for 750 bucks):

I bought this item on the end Feb, I bought it a lot 50pcs for re-sell. However, after I sell my customer, all get rejected by them. Reason being is mAh is NOT 20000mAh !!!! Because only can charge only 1-2 time max !!! It is very disappointed. Thus, I’m calling it a Tole Star's. However, the attitude is damn rude and push all the responsibility to me. He says, you can’t tell you? Unless you ask. The end, he say that you can’t get the real 20000mAh, it's maybe only 10000mAh.><In fact, I own a 13500mAh power bank also can charge up to 3-5 time, but time "10000mAh" only can charge 1-2 time, will it very funny ?? Please give me a note !! Highly NO recommended !!

and the seller’s response:))))

Seller's reply
If you’re not so much more than 20000mah And I’m recommand that I’m not sure you want it.

Bottom line: they sold 50 pieces for 750 bucks and called them a fool: D

Post has been editedas16 - 05.02.15, 16:51


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Lenovo a660>>ZTE v967s>>ZTE Nubia M2
Lexa071
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28.05.13, 22:09
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I also want to buy a small charge just in case in the range of 1000-1500r.
Considered the option of a charger in the form of a box (2 batteries already in the kit) on two 18650 for 600r., + 300r. for a replaceable pair of batteries. But it comes out 1000r and about a month of waiting for Chinese noname.
He began to look for something more reliable, found the energizer with a guarantee, protection and a set of adapters and within the budget (you can google the video review onsavagemessiahzine.com). I bow to the second option, I will soon take it.
Tiesto99
Message#20
07.06.13, 16:56
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Tell me, I want to take a portable charger, which one is better? just like something yoobao yb-651 good is it? and who polhuetsya?
Tiesto99
Message#21
09.06.13, 12:19
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Well, is it worth 2500? And can 13000 amps be written as given? and then I read the boy enough only 2 times to charge Galaxy 4

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