Database Users

[Q] Make this tablet USB rechargeable ?

Hi I bought what I believe to be a Wopad V7+ ..
The ac/dc power supply broke and it's tough to find a compatible plug (very tiny) ...I'm waiting for a hopefully compatible charger to be shipped...
The tablet is officially not rechargeable/powerable via the micro-usb but I wondered if someone could point me to a (noob-friendly) way/HACK to make it rechargeable or at least powerable via USB ?
I can't post external links but I know it's powered by 5v 2A and you can find the pictures/information at dealextreme. sku104916 or at wopadusa.com store It seems to be AKA: HAIPAD M8 /Zixoon V78c / McPad V7+ / MOMO 1000 (BUT Resistive touchscreen)
You can see the internal components on a youtube video v=8SiLWpLCfus
there is pics of internal on twitpicDOTcom (/photos /bjlandsberger)
OR THERE : chinadigitalcommDOT com (/ haipad-m8-vimicro-vc882-t10830-10 DOT html)
or http twitpic DOT com ( /6i0ouo/full )
These pics/video aren't mine as I didn't DARE to open mine.
I apologize if my english makes your eyes bleed. Any help is welcome

USB can't provide 2A of current you'll have to buy a new charger
Sent from my X10i using XDA App

nugget1993 said:
USB can't provide 2A of current you'll have to buy a new charger
Sent from my X10i using XDA App
Click to expand...
Click to collapse
that shouldn't matter. It would still charge, just much slower. Just cut open the charging wire and a USB wire. Find which wire is positive and negative on your charging wire. connect the red usb wire to the positive wire in the charging cable. Connect the black wire to the negative wire. Insulate. It should charge.
Note- if you switch the wires, you can permanently screw up your tablet.

This. Just be extra sure not to cross up your wires, I did this once with a USB hub and fried the board. It literally left melted plastic on my desk.
Epic_VS said:
that shouldn't matter. It would still charge, just much slower. Just cut open the charging wire and a USB wire. Find which wire is positive and negative on your charging wire. connect the red usb wire to the positive wire in the charging cable. Connect the black wire to the negative wire. Insulate. It should charge.
Note- if you switch the wires, you can permanently screw up your tablet.
Click to expand...
Click to collapse

It's a 3.7v battery which means it can charge at 5V. Looks dooable with a .5A Regulator and a 1ohm resistor... I'd try this and if it fails, then you've tried and failed

So it is a 3.7 but the problem is that is a raw battery pack as in no protection, no regulation, no charging circuit. If you want to sit there and babysit you could attempt to put 5.0V on the power lines and that might work. I would say it is dangerous to do so.

Epic_VS said:
Connect the black wire to the negative wire. Insulate. It should charge.
Note- if you switch the wires, you can permanently screw up your tablet.
Click to expand...
Click to collapse
No risk of fire/explosion ? What would be the best way to insulate ? heat Shrink tube + tape ?
I planned using a ACDC inwall 110 to USB 5v 1A out adapter, would it be risky ?
Will I have to babysit it to prevent a fire ???
Errrr...
.5A Regulator and a 1ohm resistor.. Maybe with a graph and picture I could figure how to do it ... I don't know anything about electronic/tension ohm's law.. I don't want the battery to explode and rip my head apart.

No matter, go for it, it will be OK, all li-ion batt used in mobile device have a small protection circuit in it(unless specified) ur batt too have it, use heat shrink tube, a 100-300ma USB current can't make it explode.
Sent from my HTC HD2 using XDA App

moto xoom...
Hmm....is this possible to do? If so I would like to try it on my Xoom, the little pin charger is annoying I bent the hell out of it. Micro USB would be stronger . All pros no cons.

For the most part putting 5V on a 3.7V load is not overly dangerous. In order for you to charge a battery, the voltage being applied to the battery has to be greater than the potential storage of the battery. In this case, greater than 3.7V. My blackberry charger is 5V regulated output.
We use 3A power supplies all the time to charge 12V batteries. The voltage we set it to is 14V. These power supplies aren't smart. They just dump current. The higher the voltage pf the battery gets, the lower the current gets as it starts to resist the current that is coming into it. Even your cars alternator puts out 14V and yet the car battery is 12V. For the most part, the actual voltage of batteries is 10%-15% higher than what it is rated at as well. So your 3.7V battery is more like 4.05V - 4.20V when it has a full charge.

But, this is not going to give much big problems. As the current is only 10-20% of the original batt amp, so it will be ok, but for high current ratings the voltage must not be more than 1-1.5 v higher than the batt voltage.
More over the ditachable batt of most phones /pda have inbuilt i-v regulator inside the batt. It will prevent overcharging and deep discharging on most cases.
Sent from my HTC HD2 using xda premium

WOW thanks a lot for the informations, if my RMA doesn't go as I want I'll probably settle to try this and keep this post updated.
Thanks a lot. XDA is great.
My two other (unanswered) threads:
http://forum.xda-developers.com/showthread.php?t=1477288
http://forum.xda-developers.com/showthread.php?t=1480517

Apparently the usb cables were made thicker with more recently manufactured S3's

Just comparing my S3 with my sisters S3, i realised that the bundled usb cable is actually thicker on more recently sold phones.
I noticed this after trying different chargers to try getting her phone charging properly again, and found that her thinner cable was providing less power then say a completely hard wired travel mate charger, In result, her usb cable was providing enough juice to maintain a level of charge but not providing the power necessary to charge it.
I'm used to LION battery circuits being on a switch setup, so that the device is powered completely from the external source during the charge, however the charging on these phones (and possibly other samsung phones) passes through the battery itself, so it does seem that inferior cables can and do affect charging times, atleast while the device is operating.
So to those complaining about slow/no charge, check the quality of your bundled cable, the thicker cables are certainly harder to bend and feel more durable than those sold with the phones earlier in the year.
I found that a good way to check this is when the battery is at 80%, a good quality cable or travelmate charger will increase the current voltage value in battery stats (*#0228#) from 4000xish to 4250+ upon plugin. The inferior cable (or maybe it was damaged even?) may increase it to 41xxish and the battery will appear to take forever to charge, or not at all.

Squall-Leonhart said:
Just comparing my S3 with my sisters S3, i realised that the bundled usb cable is actually thicker on more recently sold phones.
I noticed this after trying different chargers to try getting her phone charging properly again, and found that her thinner cable was providing less power then say a completely hard wired travel mate charger, In result, her usb cable was providing enough juice to maintain a level of charge but not providing the power necessary to charge it.
I'm used to LION battery circuits being on a switch setup, so that the device is powered completely from the external source during the charge, however the charging on these phones (and possibly other samsung phones) passes through the battery itself, so it does seem that inferior cables can and do affect charging times, atleast while the device is operating.
So to those complaining about slow/no charge, check the quality of your bundled cable, the thicker cables are certainly harder to bend and feel more durable than those sold with the phones earlier in the year.
I found that a good way to check this is when the battery is at 80%, a good quality cable or travelmate charger will increase the current voltage value in battery stats (*#0228#) from 4000xish to 4250+ upon plugin. The inferior cable (or maybe it was damaged even?) may increase it to 41xxish and the battery will appear to take forever to charge, or not at all.
Click to expand...
Click to collapse
Is there a way to see the charging current?

Have u check the five pin on the cable? Mine missing 1 pin, making the charger slow. Already compare it with working charger.
Sent from my GT-I9300 using xda app-developers app

Use current widget from market for current flow to device
Sent from my GT-I9300 using xda app-developers app

azrieqb said:
Have u check the five pin on the cable? Mine missing 1 pin, making the charger slow. Already compare it with working charger.
Sent from my GT-I9300 using xda app-developers app
Click to expand...
Click to collapse
The 4th (or second, depending on which way you're looking at it) pin does not exist on any USB to micro or micro USB adapter cables.
see http://forum.xda-developers.com/showthread.php?t=1174919
standard usb plugs only have 4 pins, 2 for data data, 1 for ground and the last voltage, so this extra pin is never available on any adapter cables, including phone charge cables - its not even present in my travel mate charger, so that pin missing has nothing to do with the slow charge.

I am very sure that my wife charger have 5 pin and working fine, and mine lost 1 pin very slow in charging. We both using the same phone. Btw, I am referring to the pin that's connected to the phone. Not the one to the plug.
Sent from my GT-I9300 using xda app-developers app

[Q] S4 only charges when plugged in to my computer

My phone only goes into charging mode when I plug it in to my computer. Anyone have this problem?

tawalla said:
My phone only goes into charging mode when I plug it in to my computer. Anyone have this problem?
Click to expand...
Click to collapse
Have not had this problem myself. Try another USB charger? Just about anything that's 500mA will work (albeit not nearly as fast as the 2.0 amp charger that came with your phone).
I suspect your charger.

Aou said:
Have not had this problem myself. Try another USB charger? Just about anything that's 500mA will work (albeit not nearly as fast as the 2.0 amp charger that came with your phone).
I suspect your charger.
Click to expand...
Click to collapse
It was the cable. I really didn't suspect it would be that since I have barely used it and I've only had it for two weeks. Thanks!

tawalla said:
It was the cable. I really didn't suspect it would be that since I have barely used it and I've only had it for two weeks. Thanks!
Click to expand...
Click to collapse
Good to hear it was a simple solution. You might check with the place you purchased it from to see if they will provide a new cable. I guess we can just be glad you didn't find out about the cable during the middle of an Odin flash...

Aou said:
Good to hear it was a simple solution. You might check with the place you purchased it from to see if they will provide a new cable. I guess we can just be glad you didn't find out about the cable during the middle of an Odin flash...
Click to expand...
Click to collapse
No kidding. That would hurt a little

I am now having this problem after my phone got wet. No AC or DC chargers will work but the phone will always charge from a computer or even the USB interface of a car.
Even if I can get an AC or DC charger to be recognized, the phone will show as charging but the battery will continue to decline.
It is making no sense to me though I assume getting the phone wet partially fried something.

Yeah the voltage is increased to charge you battery when on AC power, at the kernel level. USB voltage is lower. So i'd say surely fried, and will no doubt stop working sooner or later.
I know that on my s2 I had an issue where it would say its charging and when I woke up in the morning no charge at all. The pin/row of pins or bar if you will would bend down and not make good contact. I used a tooth pick to pry up on it every time it did that.

Jnewell05 said:
Yeah the voltage is increased to charge you battery when on AC power, at the kernel level. USB voltage is lower. So i'd say surely fried, and will no doubt stop working sooner or later.
I know that on my s2 I had an issue where it would say its charging and when I woke up in the morning no charge at all. The pin/row of pins or bar if you will would bend down and not make good contact. I used a tooth pick to pry up on it every time it did that.
Click to expand...
Click to collapse
Thanks. I didn't realize that the charging port was removable on the S4 so I swapped that out and all is fine now. :good:

Ummm... No its not the voltage. It is the ID pin. The voltage stays the same. The only actual difference is the milliamp mAH output of the charger. A normal USB plug has 500mA our charger has 2000. How the phone tells the difference? The 2 data pins inside he charger are shorted together. The voltage always stays the same.
Sent from my SAMSUNG-SGH-I337 using XDA Premium 4 mobile app

[Q] Pogo - Cigarette Lighter Charger

I can't seem to find the answer I'm looking for anywhere so here it goes..
I am mounting a Nexus 7 in my car with a bluetooth head unit to get sound through my speakers. If I make a dock containing pogo pins to charge the device, can I run those pins to my cigarette lighter so the N7 charges will the car is on? I have a 12v to 5v 3A converter on the way if needed. I really don't want to fry my battery and have to start over.
Could this idea cause any problems? Thanks in advance.

I don't think the pogo pins will charge the device fast enough to keep up with the usage. So if you travel it will slowly deplete. It is a slow charge. People do this though.
You should also look into installing a wireless charger under your battery door so it charges through induction like the Nexus 4. There are videos that walk you through this. Usually they connect the wireless disc up to the pogo pins or to the battery contacts directly.
The N7 will shut off charging once the battery is full, so youd want the power always on through to the cable.
Food for thought. There are numerous threads here in the forums that show people doing this and their findings. I would do the induction charge though for ease of removal and hassle. You can pick up a touchstone charger and disc for probably $20 on eBay. There are specific models to look for and the details would have to be researched.
My buddy did his N7 and he said it was super easy. His only beef was the N7 was too heavy for the included magnets to really keep a secure connection and some people also purchased stronger magnets for under the battery door to fix this. They turned out so strong that the N7 would actually hang simply by the magnets so it kind of "snaps" in place.
Sent from my Nexus 7 using XDA Premium HD app

[Q] Pandora sleep

Just got my Nexus 10. Where is the Menu button?
I'm looking for the sleep timer in Pandora. I know I could access it under the Menu button in other device, but this Nexus 10 doesn't have the Menu button and not showing anything similar. I dig under settings but nothing there about SLEEP.
Background, I did all the updates and got KitKat. I don't know what they change/improve with KitKat but I'm not impress.
A few more questions...... should I dig to find the CPUID if worse come to worst should I need it? My A500 needed the CPUID to get access when it bite the dust. I hadn't root or anything yet, I did that with the A500 but seem nothing I do need root. I spent months looking through and trying to fix my A500. Nothing work. Can't flash any of the ROM, can't restore. All I got are Acer logo/dead android icon/attempting to read backup.zip rom from microSD. Seem like the memory is corrupted.
What accessories do you get for your Nexus 10? I got the adapter cable miniUSB to full size USB so I can plug in my flash drive. Sux Nexus don't have microSD.
What case do you like and why?
thanks.
PS: I did search and seem like none of you guys sleep listening to music.

Lots of view but nobody is replying... how come?
I can't believe this tablet take so long to charge from zero % to 100%. I've start charging it since 9am and now it's 4:12pm and only 97% charged. wow Using the AC charger that come with this tablet. Manual said the charger is 2A but the tiny text spec on the charger said 0.2A.

Well I can answer the charging. Buya pogo charger. Also for a case the moko slim is a good cheap case.
Sent from my Nexus 5 using xda app-developers app

abdel12345 said:
Well I can answer the charging. Buya pogo charger. Also for a case the moko slim is a good cheap case.
Sent from my Nexus 5 using xda app-developers app
Click to expand...
Click to collapse
thanks for the reply. I read it wrong... input is 100-240 with 0.35A. The output is 2A at 5V. That match with the owner manual. But wow that is a very long time to full charge. I think spec for USB is 3A max. I'll check out the moko case later. thanks.

battery charge time, usb.
workerantDroid said:
Lots of view but nobody is replying... how come?
I can't believe this tablet take so long to charge from zero % to 100%. I've start charging it since 9am and now it's 4:12pm and only 97% charged. wow Using the AC charger that come with this tablet. Manual said the charger is 2A but the tiny text spec on the charger said 0.2A.
Click to expand...
Click to collapse
USB is limited to 5V, the charger is putting out 2A, or 2000ma per hour so 9000Mah should = 4.5 hours, But:
max microusb can handle 1.8A, so it becomes 5 hours.
Power loss in charging (e.g. heat) is about 10%-20% (each battery is different) so becomes 5.5-6.25hr
Above 85%, to protect the battery from overheating and over-voltage, as part of battery longevity, it slowly moves into trickle charge. Compare how long it takes from say 60%-70% to 90%-100%, there is little to gain in waiting to go from 97% to 100%. Next time look after 6 hours it should have been 90%. See this chart.
You can overcome one of these limitations by use of Pogo cable which isn't limited by 1.8A of microUSB and can give 2A. Side-benefit is it is magnetically connecting so doesn't wear out your data socket microUSB with all the plugging in to get electricity. It will still trickle-charge but get you to 85% faster.
I confirmed today that the Pogo cable does not disable the microUSB socket i could use a USB harddrive (Stickmount) and use my 4G USB dongle (PPP-Widget, kernel replacement), whilst receiving power, but the 2Amp input is still not enough to charge and tax the N10 with power demands, it was slowly still discharging powering ~600mah USB harddrive plus full brightness display plus Wifi was >2A slightly.

workerantDroid said:
thanks for the reply. I read it wrong... input is 100-240 with 0.35A. The output is 2A at 5V. That match with the owner manual. But wow that is a very long time to full charge. I think spec for USB is 3A max. I'll check out the moko case later. thanks.
Click to expand...
Click to collapse
Also the menu button should pop up on the right side of the soft key bar in apps that need it. And if you want faster charging you can buy a pogo cable which charges faster but it costs 25 dollars. I would recommend just charging before going to sleep and remove it early in the morning. It takes about 5-6 hours to charge fully from a low battery like 10 percent so an extra hour shouldn't make a difference on the charger. I looked it up and it said that it's best not to leave it longer than 9 hours on charge but less than that should be fine and that was for a phone so im sure the tablet can stay longer without issues.
Sent from my Nexus 5 using xda app-developers app

workerantDroid said:
What accessories do you get for your Nexus 10? ....
Click to expand...
Click to collapse
So there is an accessories thread.....
So I've had a N7 for 17 month and a N4 for 11 month and N10 for 4 days. My experience has led me to focusing on energy input to balance the large output from the larger screen. Battery logs shows a lot more goes into the display than my N7. The power input is still only limited by microUSB plus you got the trickle-charge >85%.
So here's my list:
A dual 2.1A PSU, to get as much current as possible from the wall when I'm near a wall. The Samsung supplied one is 2Amp which is perfectly fine as the supplied MicroUSB cable is limited to 1.8A anyways, so the Pogo cable not having that limit is limited by the PSU so got a slightly higher Ampage one which can also charge something else concurrently. http://www.amazon.com/gp/product/B00BSC7FW0/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1
A 2Amp-input slim battery, this is only 5000mah but there are larger. This one fits in my pocket slim like my N4 and N7 I got larger 7000mah and 12000mah USB batteries which only 1A input. http://www.amazon.com/gp/product/B00EK3UHS8/ref=oh_details_o04_s00_i01?ie=UTF8&psc=1
Pogo cable which is not limited by the 1.8A of the microUSB port, it complements the 2.1A PSU http://www.amazon.com/gp/product/B00B2166BS/ref=oh_details_o03_s00_i00?ie=UTF8&psc=1
Case with removable keyboard. " MoKo BlueTooth Wireless Keyboard Cover Case for Google Nexus 10" (10-inch) Tablet by SAMSUNG, BLACK " but doesn't seem sold any more, it is to go beyond the edges of the N10 itself to assist with a drop-test and comfortable props on my lap or on desk with/without keyboard. The Pogo cable also complements the case as its magnetically connected so if cable is pulled it will come away easier and no damage to the N10 microUSB socket.
workerantDroid said:
PS: I did search and seem like none of you guys sleep listening to music.
Click to expand...
Click to collapse
Hmmm, I do in hotels and other situations where noise is an issue sleep with noise-isolating headphones, a Buff to keep headphones in my ears and either a brown noise or pink noise depending what is the noise type in the hotel, works good when the guy in the floor above bangs his doors from 1am and the guy next door banging around from 5am. I'd typically NOT do that with a N10 but my N4 which I have anyways in Airplane mode to not be disturbed and with an alarm set so I wake when I want to not earlier.
I guess... you mean sleep with music coming through the N10's speakers? Well its rare I could do that, either wife or someone in next hotel room or I'm on a flight and need headphones which don't annoy the next seat so noise-isolating earbuds are what I use, nice to have the speakers.
I also have one of these http://www.amazon.com/Outdoor-OT6001-Bluetooth-Adapter-Devices/dp/B009A136T2 which allows me to not cable connected to gadget (phone, N7, N10, laptop, etc) and it lets me use regular headphones which only last for me 3-6 months and is cheaper over the long term than bluetooth headphones.

nigelhealy said:
So there is an accessories thread.....
So I've had a N7 for 17 month and a N4 for 11 month and N10 for 4 days. My experience has led me to focusing on energy input to balance the large output from the larger screen. Battery logs shows a lot more goes into the display than my N7. The power input is still only limited by microUSB plus you got the trickle-charge >85%.
So here's my list:
A dual 2.1A PSU, to get as much current as possible from the wall when I'm near a wall. The Samsung supplied one is 2Amp which is perfectly fine as the supplied MicroUSB cable is limited to 1.8A anyways, so the Pogo cable not having that limit is limited by the PSU so got a slightly higher Ampage one which can also charge something else concurrently. http://www.amazon.com/gp/product/B00BSC7FW0/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1
A 2Amp-input slim battery, this is only 5000mah but there are larger. This one fits in my pocket slim like my N4 and N7 I got larger 7000mah and 12000mah USB batteries which only 1A input. http://www.amazon.com/gp/product/B00EK3UHS8/ref=oh_details_o04_s00_i01?ie=UTF8&psc=1
Pogo cable which is not limited by the 1.8A of the microUSB port, it complements the 2.1A PSU http://www.amazon.com/gp/product/B00B2166BS/ref=oh_details_o03_s00_i00?ie=UTF8&psc=1
Case with removable keyboard. " MoKo BlueTooth Wireless Keyboard Cover Case for Google Nexus 10" (10-inch) Tablet by SAMSUNG, BLACK " but doesn't seem sold any more, it is to go beyond the edges of the N10 itself to assist with a drop-test and comfortable props on my lap or on desk with/without keyboard. The Pogo cable also complements the case as its magnetically connected so if cable is pulled it will come away easier and no damage to the N10 microUSB socket.
Hmmm, I do in hotels and other situations where noise is an issue sleep with noise-isolating headphones, a Buff to keep headphones in my ears and either a brown noise or pink noise depending what is the noise type in the hotel, works good when the guy in the floor above bangs his doors from 1am and the guy next door banging around from 5am. I'd typically NOT do that with a N10 but my N4 which I have anyways in Airplane mode to not be disturbed and with an alarm set so I wake when I want to not earlier.
I guess... you mean sleep with music coming through the N10's speakers? Well its rare I could do that, either wife or someone in next hotel room or I'm on a flight and need headphones which don't annoy the next seat so noise-isolating earbuds are what I use, nice to have the speakers.
I also have one of these http://www.amazon.com/Outdoor-OT6001-Bluetooth-Adapter-Devices/dp/B009A136T2 which allows me to not cable connected to gadget (phone, N7, N10, laptop, etc) and it lets me use regular headphones which only last for me 3-6 months and is cheaper over the long term than bluetooth headphones.
Click to expand...
Click to collapse
thanks. I ordered that pogo cable. so expensive but no other choice.
I mean the sleep in Pandora. I want to set Pandora to turn off in about 30mins or so. but I can't find this menu to get to set sleep. any1 find this sleep?

workerantDroid said:
I mean the sleep in Pandora. I want to set Pandora to turn off in about 30mins or so. but I can't find this menu to get to set sleep. any1 find this sleep?
Click to expand...
Click to collapse
From the Pandora help page:
*Android tablets do not have the built-in sleep timer option.
http://help.pandora.com/customer/portal/articles/1022606

well just a generic timed app killer app?
sharksfan7 said:
From the Pandora help page:
*Android tablets do not have the built-in sleep timer option.
http://help.pandora.com/customer/portal/articles/1022606
Click to expand...
Click to collapse
What about killing the Pandora app after a given amount of time? Say this one (I not tried but it looks like a good candidate)

sharksfan7 said:
From the Pandora help page:
*Android tablets do not have the built-in sleep timer option.
http://help.pandora.com/customer/portal/articles/1022606
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Click to collapse
I never thought they would remove that specifically for tablet. never occur to me. thanks. at leat that confirm I'm not blind.