Author Topic: GPD Q9 battery  (Read 1673 times)

Munchausen (OP)

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GPD Q9 battery
« on: January 08, 2018, 07:02:50 pm »
My Q9 battery stopped working... well to be honest it never worked great but now it wont even hold enough charge for the device to finish booting.

I've measured the space available and have ordered one of these: https://www.aliexpress.com/item/3-7V-8000mAH-7067112-Polymer-lithium-ion-battery-Li-ion-battery-for-POWER-BANK-tablet-pc/32793302390.html

It has much higher capacity than the original. I'll let you know how it goes...

sirp0p0

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Re: GPD Q9 battery
« Reply #1 on: January 09, 2018, 12:03:32 am »
Should work I think. Careful not to short anything out when soldering it.

Munchausen (OP)

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Re: GPD Q9 battery
« Reply #2 on: January 20, 2018, 09:24:16 pm »
Well, I have replaced the battery today. The procedure was not very hard, the main thing is to remove the entire LCD as the battery is stuck to it with pretty strong tape. So you should remove the LCD and use a tool to separate the old battery from the LCD, I am sure that if you try to force it out without doing this you will crack the LCD. The soldering is very simple.

However, I still have a battery problem. After I attached the new battery I tried once to power up and check it is working. It booted up OK, but the battery meter said the battery was almost empty. I thought this was a bit strange, since lithium batteries are normally supplied at least 60 or 70% charged. I powered off, and plugged the charger in, but it does not seem to be charging. Has been plugged in for a few hours now and when I try to power it on I just get a blue LED light turn on for a few seconds (you can see it through the connector holes) and then nothing. I haven't seen the battery charging screen even. This is the same behaviour as with the old battery.

With the original battery, if I left it plugged in all night it would try to start booting in the morning, but never finish. I think that there is either something wrong with the charge circuit on my device, or I am simply not providing enough current? I only have 1A USB chargers available, could it be that it just needs more juice?

Update: It powered on again, but only for 5 mins. It doesn't detect a charger at all, tried 3 different ones and many different USB cables. I think this device is toast :(
« Last Edit: January 20, 2018, 09:53:05 pm by Munchausen »

sirp0p0

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Re: GPD Q9 battery
« Reply #3 on: January 20, 2018, 10:10:33 pm »
Sounds like it could be something wrong with the Q9 itself and not a battery issue. If you have a multimeter, or have access to one (friend or family maybe?), the easiest way to check if the battery is charged is to set it to DCV and check across the contacts. A lithium battery usually works in the range of 3V to 4.2V. Anything lower or higher can damage the cell.

I would also check the old battery if you can. If they are within range, it's definitely the Q9 that's at fault.

Otherwise it could be you were unlucky and got a dud battery from Aliexpress. If the battery was too undervoltage, the Q9 would probably not even try charging it at all for safety reasons.
« Last Edit: January 20, 2018, 10:12:06 pm by sirp0p0 »

Munchausen (OP)

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Re: GPD Q9 battery
« Reply #4 on: January 20, 2018, 10:15:10 pm »
New battery reads 3.8V

Old one 3.02V

So I think the device is kaput.

Annoying really because I am reluctant to buy another GPD device now and everything else available is similar specs and more expensive.

In the interests of thoroughness I will remove the new battery, clean the contacts and solder again, in case I have a dry joint or something.

Update: No change. Just thought I should try to boot into recovery to see if that shows the charger connected, just trying to remember how to do it...

... ok, no recovery on these devices?

So I noticed something strange, if the device is locked with the screen off, and I plug the charger in, the display comes on. But it doesn't show it as charging. So it is detecting the charger at some level, but it looks as though something is definitely not working as it should with the device itself. When I power it on it shows the battery at about somewhere between 10 and 20%, but it goes down 1% every 10 seconds or so and then turns off.

I do have a hot air rework gun and could find the IC responsible for charging and give it a blast, but this is a bit random and not all that likely to help I would think.
« Last Edit: January 20, 2018, 10:39:06 pm by Munchausen »

sirp0p0

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Re: GPD Q9 battery
« Reply #5 on: January 21, 2018, 11:05:18 pm »
It does get hot inside, so maybe something became unseated. Using the hot air or baking it in the oven could work.
"If it's already fucked, you can't fuck it any more."

There's no recovery like TWRP or CWM but by holding either + or - when booting should put you into either download mode or a basic recovery. Not sure which is which.

Munchausen (OP)

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Re: GPD Q9 battery
« Reply #6 on: January 22, 2018, 11:17:49 am »
Hmm, well it is tempting to disconnect everything and stick it in the oven for a couple of minutes. This site [1] seems to suggest 200 deg C for 8 minutes, but that seems like a long time to me. :-\

I think both batteries are flat now though so I would need to find a way to charge one of them to check it afterwards.

[1] http://www.computerrepairtips.net/how-to-reflow-a-laptop-motherboard/

sirp0p0

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Re: GPD Q9 battery
« Reply #7 on: January 23, 2018, 11:04:52 pm »
Hmm, well it is tempting to disconnect everything and stick it in the oven for a couple of minutes. This site [1] seems to suggest 200 deg C for 8 minutes, but that seems like a long time to me. :-\

I think both batteries are flat now though so I would need to find a way to charge one of them to check it afterwards.

[1] http://www.computerrepairtips.net/how-to-reflow-a-laptop-motherboard/

Sounds about right. Look up a guide for "ps3 ylod oven fix" and it'll probably have a similar number. I have also read it's a good idea to cover things like connectors with stick tack to insulate it from the heat, although they should be fine. YOu never know with chinese electronics though.


Matsime

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Re: GPD Q9 battery
« Reply #8 on: February 14, 2018, 09:51:19 pm »
Evening Gentlemen,

I'm also facing battery issues with my GPD Q9.
Mine has inflated up to a thickness of about 25-30mm, which I reckon is pretty dangerous.

Anyhow, I feel attached to the device.
I'm willing to give her the benefit of the doubt and offer her a brand new heart.
However, since I can't really rely on the dimensions of the one I found inside, I was wondering if you could provide me with the dimensions of a typical Q9 battery.

According to the available room in the shell, I'm estimating the following maximum values :

Thickness < 10mm
Width < 65mm
Length < 105mm

Could anyone please confirm ?

Much gratitude,
Maxime.

Munchausen (OP)

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Re: GPD Q9 battery
« Reply #9 on: February 20, 2018, 01:17:12 pm »
I can't remember the dimensions, but I can tell you that the one I linked fits very well. I think it's a good replacement, it just doesn't work for me because my unit is dead.

Matsime

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Re: GPD Q9 battery
« Reply #10 on: February 20, 2018, 04:22:32 pm »
Okay thank you very much !

midknight

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Re: GPD Q9 battery
« Reply #11 on: February 26, 2018, 08:11:39 am »
hey Munchausen i just found your thread after creating on myself could you look at the micro usb port and see if you have broken solder joints?

Munchausen (OP)

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Re: GPD Q9 battery
« Reply #12 on: March 30, 2018, 12:08:03 am »
Hello, sorry I don't check back here often (esp now my Q9 is dead). I looked for bad joints on the microusb but I didn't see any.

I suspect there is something wrong with the charging circuit. The power management/charging IC (don't remember what the actual part no is but I looked it up at the time) gets warm (but not hot) when it is plugged in, so it is certainly sinking current. If I wanted to look more closely I could probably find the datasheet and check the voltages on it look OK to try to find the problem (if it isn't a BGA part, I can't remember now) but I don't have a lot of time to put in.

I am still unsure about baking it, though I have given it a bit of thought. I will soon be getting a planet computers gemini, which I think should do nicely for android gaming when coupled with a bluetooth control pad, so I've kind of left the Q9 for dead right now, not to say I don't miss it though.

 

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