Got a 6 x 18650 power bank, with 1A and 2A output. But will not charge my tablet.

28 posts / 0 new
Last post
myhken
myhken's picture
Offline
Last seen: 3 years 9 months ago
Joined: 07/03/2015 - 17:20
Posts: 549
Location: Norway
Got a 6 x 18650 power bank, with 1A and 2A output. But will not charge my tablet.

Hello.

I got a 5V 2A USB 18650 6 Battery Mobile Power Bank Charger Box for Cell Phone MP3 MP4, of course dirt cheap, just £2.59/pcs.
Today I tested with 6 × 18650 new batteries (of course, they was Ultrafire 5200 mAh gray color batteries, so most likely fake.). They was all charged to 100% (they was all charged to 90% and 4.2V when I got them)

I then tried to charge a phone with both the 1A and 2A port, and it worked fine.
But when I tried to charge my PAD ( ASUS Transformer Pad TF300TG 3G) it will not charge it. The PAD requires either 15V = 1.2A, or 5V = 2A (that what is says on the two chargers I have to the PAD). And my new power bank should create a output of 5V = 2A on the 2A port?

Of course, it’s most likely the cheap power bank there is something wrong with. I’m waiting for better batteries, but to then, can somebody come up with some links/name on good power banks with 4 or 6 (I think I want 6) × 18650 batteries, that actually can charge my PAD?

Kenneth Myhre

Edited by: myhken on 07/05/2015 - 16:50
NikolaS
NikolaS's picture
Offline
Last seen: 8 months 4 days ago
Joined: 02/07/2014 - 13:26
Posts: 1272
Location: intersection of all roads

Try this one,they are original with LG,or Panasonic cells inside

http://www.gearbest.com/mobile-power-bank/pp_143298.html
http://www.gearbest.com/mobile-power-bank/pp_144271.html

Or if you want to use yours batteries. I have this one and its very good… Just please dont use Ultrafire 5200 mAh !!!

http://www.gearbest.com/chargers/pp_171370.html

myhken
myhken's picture
Offline
Last seen: 3 years 9 months ago
Joined: 07/03/2015 - 17:20
Posts: 549
Location: Norway

NikolaS wrote:
Try this one,they are original with LG,or Panasonic cells inside

http://www.gearbest.com/mobile-power-bank/pp_143298.html
http://www.gearbest.com/mobile-power-bank/pp_144271.html

Or if you want to use yours batteries. I have this one and its very good… Just please dont use Ultrafire 5200 mAh !!!

http://www.gearbest.com/chargers/pp_171370.html

I already have some original power banks that works fine, but want to find a cheap but good diy power bank and put in some of my new batteries I will get the next 30-60 days :D, and if they work good, maybe I will give some away.

And no, will not use Ultrafire or any fire batteries in them.

Have ordered some Soshine E3 Portable Mobile Power Bank now, so will we see how they work with my Sanyo batteries.

Kenneth Myhre

NikolaS
NikolaS's picture
Offline
Last seen: 8 months 4 days ago
Joined: 02/07/2014 - 13:26
Posts: 1272
Location: intersection of all roads

You did well, now you can use it like a charger and a power bank also,quality is very good !

myhken
myhken's picture
Offline
Last seen: 3 years 9 months ago
Joined: 07/03/2015 - 17:20
Posts: 549
Location: Norway

Don’t know why, but they sell the same E3 model for 12.98 in the same store…
http://www.gearbest.com/mobile-power-bank/pp_136425.html

Kenneth Myhre

NikolaS
NikolaS's picture
Offline
Last seen: 8 months 4 days ago
Joined: 02/07/2014 - 13:26
Posts: 1272
Location: intersection of all roads

there are times when a product is discounted to leave at the same old price…

ohaya
Offline
Last seen: 3 years 7 months ago
Joined: 03/16/2013 - 19:01
Posts: 5337
Location: US

myhken wrote:
Hello.

I got a 5V 2A USB 18650 6 Battery Mobile Power Bank Charger Box for Cell Phone MP3 MP4, of course dirt cheap, just £2.59/pcs.
Today I tested with 6 × 18650 new batteries (of course, they was Ultrafire 5200 mAh gray color batteries, so most likely fake.). They was all charged to 100% (they was all charged to 90% and 4.2V when I got them)

I then tried to charge a phone with both the 1A and 2A port, and it worked fine.
But when I tried to charge my PAD ( ASUS Transformer Pad TF300TG 3G) it will not charge it. The PAD requires either 15V = 1.2A, or 5V = 2A (that what is says on the two chargers I have to the PAD). And my new power bank should create a output of 5V = 2A on the 2A port?

Of course, it’s most likely the cheap power bank there is something wrong with. I’m waiting for better batteries, but to then, can somebody come up with some links/name on good power banks with 4 or 6 (I think I want 6) × 18650 batteries, that actually can charge my PAD?

Are the batteries in parallel in the box? If so, then their output would be only ~4.2V. If the tablet actually NEEDS 5V for charging, the ~4.2V output from the battery box may not be sufficient and maybe that’s why it’s not charging the tablet?

myhken
myhken's picture
Offline
Last seen: 3 years 9 months ago
Joined: 07/03/2015 - 17:20
Posts: 549
Location: Norway

ohaya wrote:

Are the batteries in parallel in the box? If so, then their output would be only ~4.2V. If the tablet actually NEEDS 5V for charging, the ~4.2V output from the battery box may not be sufficient and maybe that’s why it’s not charging the tablet?

They are all in the same direction yes.

Kenneth Myhre

Richie086
Richie086's picture
Offline
Last seen: 27 min 14 sec ago
Joined: 01/06/2012 - 08:43
Posts: 1667
Location: Long Island, New York
myhken wrote:
can somebody come up with some links/name on good power banks with 4 or 6 (I think I want 6) × 18650 batteries, that actually can charge my PAD?

This is a new brand power bank I just got my hands on. I purchased it and the smaller pocket size version to replace our NewTrent brand power banks that were getting old. This Jackery Giant+ has been the only power bank that has been able to fully charge my iPad 1st Generation fully from a depleted 5% charge to full. What got me to purchase it was the fact it’s one of the only companies to boast using premium cells. It’s a keeper for me, and the small pocket version was able to charge our iPhone 6 plus from dead to 88%.

Jackery Giant

Richie

Racer
Racer's picture
Offline
Last seen: 5 years 5 months ago
Joined: 05/07/2013 - 00:39
Posts: 1792
Location: Hillsboro, OR

What I have noticed from building my own power banks and reviewing off-the-shelf ones that different companies send me is that there is no one charging specification that all the devices and power banks use to be compatible.

Some devices will only charge if they detect a “smart” charger and some devices will charge as long as they detect the right voltage/current. Some devices don’t seem to care one way or another. For devices which will not charge with a specific power bank, I have a “charging cable” which I believe is just a micro USB cable with the data pins shorted. About 8 times out of 10 this little cable will make everything start working. But day to day, I just carry the power banks that play well with whatever devices I’m carrying.

Halo...
Halo...'s picture
Offline
Last seen: 5 years 3 months ago
Joined: 12/15/2011 - 02:39
Posts: 3304
Location: Halo island

1 +
As Racer said many devices (tablets, phones) will not charge if you simply provide 5 volts at 2 Amps. The tablet checks the usb data pins, if it does not see the identification it wants, it will not charge.

The other possibility is that the usb identification does match what your tablet wants but the power bank is just junk. The tablet tries to take 5 volt at 2 Amps but the power banks can’t really provide it, the voltage drops and your tablet rejects the power bank as not suitable.

Halo...
Halo...'s picture
Offline
Last seen: 5 years 3 months ago
Joined: 12/15/2011 - 02:39
Posts: 3304
Location: Halo island
Richie086 wrote:
the small pocket version was able to charge our iPhone 6 plus from dead to 88%.

Richie086, the Jackery Giant sounds nice. The pocket version you have is the single 18650 one, correct? Have you by chance tried it with any android devices?

Racer
Racer's picture
Offline
Last seen: 5 years 5 months ago
Joined: 05/07/2013 - 00:39
Posts: 1792
Location: Hillsboro, OR

It’s hard to blame the device manufacturers for their devices being picky about charging. You’re charging a $600 tablet/phone/whatever with a $20 charger, and when your junk charger melts your expensive device, you’re going to send that device back to the manufacturer and expect a new one.

Richie086
Richie086's picture
Offline
Last seen: 27 min 14 sec ago
Joined: 01/06/2012 - 08:43
Posts: 1667
Location: Long Island, New York
Halo… wrote:
Richie086 wrote:
the small pocket version was able to charge our iPhone 6 plus from dead to 88%.

Richie086, the Jackery Giant sounds nice. The pocket version you have is the single 18650 one, correct? Have you by chance tried it with any android devices?

Halo,

There are some FAQ by folks on Amazon, from what I have read, it will charge an Android device. One such question is below:

*_Does this work with an android?

A: works with anything that has a USB connection for power ie like the iphone charging cable Damian MCCANN answered on June 17, 2015 _*

JACKERY MINI

Richie

Racer
Racer's picture
Offline
Last seen: 5 years 5 months ago
Joined: 05/07/2013 - 00:39
Posts: 1792
Location: Hillsboro, OR

Saying “it will charge an Android device” doesn’t account for the fact that there are thousands of Android devices out there and not all of them are compatible with chargers and power banks that claim to have a generic compatibility with Android devices. Deductive reasoning will help narrow it down if you try different devices with your power bank and different power banks with your device, in addition to testing different cables.

Richie086
Richie086's picture
Offline
Last seen: 27 min 14 sec ago
Joined: 01/06/2012 - 08:43
Posts: 1667
Location: Long Island, New York
Racer wrote:
Saying “it will charge an Android device” doesn’t account for the fact that there are thousands of Android devices out there and not all of them are compatible with chargers and power banks that claim to have a generic compatibility with Android devices. Deductive reasoning will help narrow it down if you try different devices with your power bank and different power banks with your device, in addition to testing different cables.

I fully agree with you.

Richie

snakebite
snakebite's picture
Offline
Last seen: 5 days 13 hours ago
Joined: 11/20/2013 - 20:21
Posts: 2064
Location: dayton oh

my asus tf101 is very fussy.i wired a 12v cable up for it.
so dont feel bad that your 5v power bank wont charge it.seems to be a common wart with the whole series.mine wont charge from 5v.

myhken
myhken's picture
Offline
Last seen: 3 years 9 months ago
Joined: 07/03/2015 - 17:20
Posts: 549
Location: Norway
snakebite wrote:
my asus tf101 is very fussy.i wired a 12v cable up for it. so dont feel bad that your 5v power bank wont charge it.seems to be a common wart with the whole series.mine wont charge from 5v.

Discovered this today also. I tried to charge with some GP power banks that I have got here in Norway (10400 and 12000 mAh) and it will not charge the pad either. I was sure I charged the pad when I was on two trip in India the last year, but I must have used my travel charger to the pad.

But good to know that is was not a bad power bank or bad batteries then. Big Smile

Kenneth Myhre

WarHawk-AVG
WarHawk-AVG's picture
Offline
Last seen: 1 year 6 months ago
Joined: 01/04/2014 - 06:47
Posts: 5071
Location: H-Town

I wonder if the data pins have the correct charge signature on them

The small charge booster board I designed that shorts the D- and D+ pins together will allow an iPhone or iPad to charge from any 5vdc port (even a charging downstream port vs a dedicated charge port) because it tricks the device into thinking it is on a “charger” device rather than a computer…albeit at a 5W or 1A rate, but they will charge

This is my DCP enumerator board

A little info on the charge capability/power capability of USB
https://en.wikipedia.org/wiki/USB#Power

Halo...
Halo...'s picture
Offline
Last seen: 5 years 3 months ago
Joined: 12/15/2011 - 02:39
Posts: 3304
Location: Halo island

They have power banks with smart DCP now. Only kind I would get.
RAVPower 3000mAh Power Bank – 2nd Gen Luster Mini Scroll down and you’ll see the other models they have, most do well over 2 amps.
Anker also sells several models of smart DCP power banks

Rufusbduck
Rufusbduck's picture
Offline
Last seen: 7 months 2 weeks ago
Joined: 04/04/2012 - 15:34
Posts: 10389
Location: Golden state

Cut the barrel connector of a 12V .5A wall wart and got my truck started. Gotta love dumb devices.

Three Tanna leaves to give him life, nine to give him movement. But what if he eats the whole bag?

Scott

Racer
Racer's picture
Offline
Last seen: 5 years 5 months ago
Joined: 05/07/2013 - 00:39
Posts: 1792
Location: Hillsboro, OR

So then for the non-electronics-geniuses, what is a good DIY smart charger to put 6 good batteries in? The problem with these off the shelf chargers is that they are universally nowhere near their stated capacities from what I’ve seen.

Noki
Offline
Last seen: 5 years 2 weeks ago
Joined: 08/16/2014 - 21:15
Posts: 167
Location: Serbia/Malaysia

I can highly recommend 4×18650 Coolook PB-2000.
I bought 2 from Fasttech. My android tablet and phones, my iPod, all Apple devices I tried charges great with this unit. My friends are using it when they come over and it newer fails to charge. It charges my picky Galaxy Tab 7.7 with same current as original Samsung charger. It can supply more that 2A without problems. By the way, I’m using some old laptop pulls in the power bank and I’m sure it’ll be even better with nice new batteries. Another thing I like is that battery voltages are nicely balanced when discharging. That’s not the case with some 3×18650 ENB power banks I’ve had. HKJ tested this power bank some times ago, here’s the review: http://budgetlightforum.com/node/20131

Racer
Racer's picture
Offline
Last seen: 5 years 5 months ago
Joined: 05/07/2013 - 00:39
Posts: 1792
Location: Hillsboro, OR

Thanks for the recommendation, Noki. Looks like a nice charger. I have a Ruinovo I like, and it has 4 green Sony cells from a laptop pull. The 4 cells all tested about 2000 mAh but I could do way better with 4 Panasonic, and I like the Ruinovo too much to mess with it, though it can be a little picky about what it charges.

The Ruinovo is a nice, brushed aluminum but it’s killed a few devices by scratching glass/plastic with its sharp edges.

Halo...
Halo...'s picture
Offline
Last seen: 5 years 3 months ago
Joined: 12/15/2011 - 02:39
Posts: 3304
Location: Halo island

The smart DCP Anker and RAVPower power bank do not appear to lie about battery capacity.

LGABB41865 inside the previous 2600mAh model of the RAVPower power bank. LGABB41865 is indeed a 2600mAh cell.

I haven’t seen teardown pictures of the newer higher capacity models yet.



Now be aware that all power banks I have ever seen quote the battery capacity not the output after 5v boost losses. You should get 80-90% after losses. And then there are losses inside the charging circuit of your device as that 5v is dropped down to 3.0-4.2v (or up to 4.35v) during a full charging cycle. These losses are unavoidable and vary some depending on how efficient charging circuit in your device is.

A 3000mAh power bank will never equal a full 3000mAh charge of your device’s battery.

Here is two 6 cell power banks with smart DCP
Anker 16000mAh 2nd Gen Astro E5 $37
RAVPower 16000mAh 3rd Gen Deluxe $36
I’ve never seen a DIY (bring your own cells) power bank with smart DCP.

myhken
myhken's picture
Offline
Last seen: 3 years 9 months ago
Joined: 07/03/2015 - 17:20
Posts: 549
Location: Norway

Halo… wrote:

Here is two 6 cell power banks with smart DCP
Anker 16000mAh 2nd Gen Astro E5 $37
RAVPower 16000mAh 3rd Gen Deluxe $36
I’ve never seen a DIY (bring your own cells) power bank with smart DCP.

Is there anywhere else then Amazon you can get Anker power banks? Tried to order from Amazon Norwegian site, UK site and US site, and the two first site stated that they would send to Norway, but it stops and tells me that I can’t get the Anker PB to Norway.

Kenneth Myhre

Davx
Davx's picture
Offline
Last seen: 5 years 9 months ago
Joined: 03/17/2011 - 20:29
Posts: 910
Location: Italy

Just to add my 2cent to the discussion, try also different usb cable…
Don’t ask me why but with chinese product (car charger, battery pack,…) not all the cable work correctly.
For example my car charger should not charge my android phone without an old micro-usb cable…

"There are always new jobs, women, and apartments......there is only ONE BLF." - Chicago X (27/03/2012)

myhken
myhken's picture
Offline
Last seen: 3 years 9 months ago
Joined: 07/03/2015 - 17:20
Posts: 549
Location: Norway
Davx wrote:
Just to add my 2cent to the discussion, try also different usb cable… Don’t ask me why but with chinese product (car charger, battery pack,…) not all the cable work correctly. For example my car charger should not charge my android phone without an old micro-usb cable…

For phones etc, that could work. For my PDA, it has a another connection, so I have to use on of two cables I have to it. No one worked.

Kenneth Myhre