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U30gt2 battery
battery compatibility
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saykooo
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2014/02/09 - 02:04
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Hi

I want to buy a new battery

my tablet is 7200 mah cube u30gt2

http://www.aliexpress.com/item/7-4V-12000mAh-CUBE-U30GT-U30GT1-U30GT2-tablet-battery-plates-66MM-3-7MM-Length-125MM-2/1615709571.html battery 12000 mah

this is bad or no problem ??

damage my device?

Thanks

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kellbain
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2014/02/09 - 03:49
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Hi,

I just ordered and installed this battery into my U30GT2:

http://www.aliexpress.com/store/product/7-4V-11000mAh-lithium-ion-battery-DIY-Cube-U30GT-U30GT1-U30GT2-dual-four-core-tablet-battery/631097_1536266414.html

It's an excellent battery and fits the tablet perfectly except for the need to cut the wires a little shorter. This is a 4 cell battery with two cells running in series and the two pairs of cells running in parallel. Because of this you will have no problem with the charger trying to charge out of balance cells.

It took two weeks for it to reach me, but then the shipping was free. I have easily doubled my old run time with the new battery. Please be careful when you solder the wires to the mainboard, you must not over heat the board or you can burn out components. Do not be tempted to use the old batteries wires, the gauge is too small and causes too much resistance. ALSO, this is a live battery, if you short it against a component you can easily burn your mainboard! 

Best of luck!

PS: I finally found the link you put in by pasting it into Google, the size of the battery is the same as the one I bought, it claims to be 1000mAh larger than mine and the output voltage is correct. They don't say that the input voltage is 12 volts, which it needs to be for the charger the tablet uses. You should text the seller (at the Aliexpress site) and ask if it's 12 volt charger input or not. Price is excellent, but they can't ship via China post as the service doesn't allow batteries to ship. Mine ended up coming via Sweden Post and it was explained in the ad that it would be shipped this way. My wife is Chinese and we have friends in China that would have shipped it for me, but were turned away at China Post. In the picture, the battery is marked as using LG cells; ask the seller if they are really LG. If they are, then buy the battery as it's a good deal. One thing, there are a lot of faked brands coming out of China and I know from experience LG batteries from China can be fake.

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saykooo
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2014/02/09 - 20:39
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kellbain said
Hi,

I just ordered and installed this battery into my U30GT2:

http://www.aliexpress.com/store/product/7-4V-11000mAh-lithium-ion-battery-DIY-Cube-U30GT-U30GT1-U30GT2-dual-four-core-tablet-battery/631097_1536266414.html

It's an excellent battery and fits the tablet perfectly except for the need to cut the wires a little shorter. This is a 4 cell battery with two cells running in series and the two pairs of cells running in parallel. Because of this you will have no problem with the charger trying to charge out of balance cells.

How many hours charging your product ?
and many hours of charging is going?

I asked the seller,cargo singapore buy +4dollar

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kellbain
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2014/02/10 - 03:30
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Hi again,

 

My battery charges in about 3 to 4 hours due to the 12V charger. Maybe less than that, but not more. As for how long does the charge last, it depends on what you do on the tablet. I get 14-15 hours per charge, but I don't stream videos much, usually online gaming and surfing the Web, and I keep brightness down low, around 10%; I find this very bright on this tablet when playing indoors.

So long as you asked the seller about the 12V input for charging and if the cells are really LG cells as shown in the picture, then pay the $4.00 extra and ship via Singapore.

 

Best of luck, Kellbain


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kikeminchas
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2014/02/11 - 16:18
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Hi Kellbain,

 

when you say: 'Do not be tempted to use the old batteries wires, the gauge is too small and causes too much resistance' what do you exactly mean? Can you lose charge because of this?

 

I'm telling you why: I bought another replacement battery, a 8600maH one. Because of the resistor soldered to the motherboard were the battery cables go, I thought 'damn it' and just patched the old cables together to the cables of the new battery. I'm not an electrician, battery seems to work fine but do you think I'm wasting maH because of this patch instead of directly soldering the battery to the motherboard?

 

Greets

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maikal
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2014/02/11 - 19:09
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Hi Kellbain,   when you say: 'Do not be tempted to use the old batteries wires, the gauge is too small and causes too much resistance' what do you exactly mean? Can you lose charge because of this?   I'm telling you why: I bought another replacement battery, a 8600maH one. Because of the resistor soldered to the motherboard were the battery cables go, I thought 'damn it' and just patched the old cables together to the cables of the new battery. I'm not an electrician, battery seems to work fine but do you think I'm wasting maH because of this patch instead of directly soldering the battery to the motherboard?   Greets

 

Are both wires the same gage?

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kikeminchas
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2014/02/11 - 22:13
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No. I don't think so.... the one of the cube looks slightly thinner and I think it had less filaments inside...

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Wastes
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2014/02/13 - 12:39
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I tested both batteries you are talking about:

Rated "11000 mAh":

http://www.aliexpress.com/store/product/7-4V-11000mAh-lithium-ion-battery-DIY-Cube-U30GT-U30GT1-U30GT2-dual-four-core-tablet-battery/631097_1536266414.html

Measured capacity after 6 cycles: 4600 mAh

Rated "12000 mAh":

http://fr.aliexpress.com/item/7-4V-12000mAh-CUBE-U30GT-U30GT1-U30GT2-tablet-battery-plates-66MM-3-7MM-Length-125MM-2/1615709571.html

Measured capacity after 3 cycles: 3900 mAh

The one I removed from my Cube after 8 months use and +- 4h working time: 3000 mAh

So the first one is better. I installed it and currently testing it.

 

The problem I had is the first battery is a little bit thicker than the original one, that leads to increased pressure on the back of the screen, giving a slight dull white stain in the middle of the screen (like a light leaking). However this is very faint and only noticeable with backlight at maximum and black screen.

Did you notice that Kellbain?

For the second battery I doubt the seller will tell you: "No, I isn't a LG battery, it's a fake…" ;-)

All 7.4 Lipo batteries are fitting the U30GT2, the tablet is regulating the charging voltage/current.

 

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kikeminchas
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2014/02/14 - 13:36
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So Kellbain, Maikal, what would you suggest. Should I do a proper job soldering the leads of the new battery to the PCB instead of patching oldl and new cables together? Do you think the possible benefits are worth the risk of re-opening and soldering? (I really don't like that resistor in between both contacts in the PCB :) )

 

Thanks!

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maikal
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2014/02/14 - 15:43
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hmmm. Well have you noticed any unusual heating up, any glitching or nay other problems since you did the connection? I'm an old 36charlie (MOS). we did alot of that with the old comm cables and switchboards in the field(in pinch) and rarely had problems if the wires were within specs! Are you getting better battery life? if everything is copasetic then so long as they are very similar in gage then I see no problems. But ideally if you can find some techie thats good at doing that sort of soldering then I would, just to have done all I could to make the thing is workable and I could then eliminate that as a posibility of still being a part of the problem. As an old wire-man my hands are not as steady as they used to be so I would not even try it. I'd go perhaps to geeksquad or staples or a computer repair guy/gal and see how much they charge! You got everything there anyway, how much could it cost?

 

Now I tell you that not having seen the inside guts of the cube on close up.

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kikeminchas
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2014/02/14 - 16:42
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Nothing unusual... I've got better battery life but then I again I put in there a higher maH battery... Apart from the possibility of extra heat generated by the supposedly added resistance, I guess that would also have an impact on battery life? (a negative impact, that is.....)

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maikal
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2014/02/14 - 18:02
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kikeminchas said
Nothing unusual... I've got better battery life but then I again I put in there a higher maH battery... Apart from the possibility of extra heat generated by the supposedly added resistance, I guess that would also have an impact on battery life? (a negative impact, that is.....)

 

Well there again regarding the heat. I am using the kitkat rom with one of DJ's OC kernel. My screen is warmer than any of the other roms I have put in there, that has gone on since DJ posted his kernel, I think about a month or so? ANd I have had OC kernels since I volunteered to be his quinea pig for that! But my tablet is not "screen-on" all day. I do read at night for a couple of hours or play with its set-up. You know. I might play with the launchers or resetting the apps to my liking. It gets the hottest while charging. But you know, I've had my Cube for I guess almost a year and the battery is still kicking. I plan to buy a battery as you did and put it somewhere safe until I need it. Heat has been an ongoing thing with it since I started playing with the kernels, but I do prefer the OC kernels!!! Thanks DarthJabba...lol

This tablet for me has been an Android learning experience and I think I have used it as a guinea pig since I bought it. What it says to me is that It was worth every penny, its tough and it gots a lot of life still left in it, if I don't brick it or make it explode :-) But I will continue to experiment with every rom, modification, kernel launcher, whathave you, I'm game. Its a tool to me, and a toy. So I guess my next step is opening it up and seeing for myself whats in there. But not yet, I guess I'll wait for the battery issue to really get bad, because as I said earlier, my hands are not as steady as they used to be.

Don't tell my wife but I do plan to buy me a spare tablet with my income tax return and hiding it someplace safe in case this one blows up. If it doesn't I think it will make a lovely gift to her with all the tune-ups we've done to it. Then I can pull the other one out of hiding....lol

 

Good luck. If it aint completely broke, leave it alone. If you have doupts, then take it to some one more experienced with that tricky soldering.

 

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DarthJabba

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2014/02/14 - 18:19
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The OC kernels do generate heat. I am still to determine whether the main heat is from the cpu or the gpu. The advantage of having kernels in CWM format is that it is easy to change to the stock kernel if one is getting worried ...

Darth Jabba, the Dark Jedi from Nal Hutta

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kellbain
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2014/02/14 - 21:51
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Regarding your battery connection: leave it as is unless you are skilled at soldering mainboards! Yes, the original gauge is smaller than I like to see, but it works so long as the connections are good end to end. One of my connections was down to a single hair thin copper filament.I had no choice but to repair the connection.

 

These are LIPO batteries, they are touchy and require constant supervision by a control module to remain stable under varying conditions. Too much resistance, voltage fluctuation, heat, cold, undercharge, overcharged or salty language can affect their performance!

 

If it is working, don't fix it!

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kikeminchas
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2014/02/18 - 10:51
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Thanks maikal, kellbain for your answers.. in the end I decided to take the risk and solder the wires to the PCB... I took off the dust of my ol'solder, took couple of trankimazin pills (joking ;-) ) and thought that worst case scenario I would have a good excuse to buy another tablet :)

Everything went fine, I have not noticed any difference at all (as expected) but at least now I know it's done properly... and had quite some (heart attack inducing) fun...

 

Cheers

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