How can I directly wire a lipo charger to tablet's battery?

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Rogue Leader

Rogue Leader

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The charger port is soldiered to the board sop there are no "wires to connect", you would need to de-soldier the connector and then attach this to it.

This is a diagram of the pinout:

micro_usb.jpg


Keep in mind you may (probably will) damage your device doing this, also the device may not charge without the ID or data connected telling it that the charger is good. I may be wrong on that.

IMO This is a REALLY bad idea, but here you go, good luck.
 
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alphacoyle

alphacoyle

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What I'm wanting to do is bypass that charger port as I have a little 500ma 3.7v charger that I'd like to connect either to the wires coming out of the battery (the ones that plug into the tablet) or directly to the pos and neg of the battery. The problem we've had with the micro usb is that it's on the bottom and not all apps rotate so it ends up getting bent, this way I could have a flexible wire coming out and keep a charge going while it's being used. This is the charger I have, http://www.banggood.com/3_7V-1S-Lipo-Battery-USB-charger-JST-plug-500ma-output-p-91269.html and like you can see the pos and neg wires coming out of the lipo battery, but on the tablet battery there are 4 wires coming out to where it plugs into the tablet http://www.etradesupply.com/catalog/product/gallery/id/24191/image/199494/ I think it's the pos and neg wires closest to the inside and since I'd be replacing the old battery anyways I can experiment on it. I tried this once with my sons old nabi tablet and connected the charger to the outside wires and the charge light would stop, when I tried it on the inside ones it seemed to work but the wires are so short I ended up pulling one out of the battery ending that. Since there are two red and 2 black I figure one has power only going out (probably the outside ones I tried first) and the inside ones receiving the charge. The 2 blue ones in the center I have no idea, but that's what I'm looking to do if anyone knows about this (and can someone tell me how to get my images to display?)
 
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Rogue Leader

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Your other problem is most tablets take a 1A charger, 500ma may well not be enough to keep the battery topped up while using the tablet. I know on my Nvidia Shield if I use my phones 850ma charger the tablet overpowers the charger and still drains the battery.
 
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alphacoyle

alphacoyle

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I know but it gives it at least 50% more user time, and it's an inexpensive fix as the little charger only cost a couple bucks and has overcharge protection (mostly made for toys like drone xcopters etc.) I just need to know how to wire it in.

 
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alphacoyle

alphacoyle

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Tried this and it did not work; there was pin type connector right at battery, was expecting a pos, neg; when I tried going deeper punctured battery (not recommended, got hot fast) I use lifepo4 cells for e-bike, they don't heat if punctured. Don't know why the industry is sticking with the micro usb when it's so fragile?
 
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AllanGH

AllanGH

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I have a house full of family members who destroy each and every micro USB port they have on tablets, phones, etc. It has gotten tedious replacing the connectors all the time, just because they are in too much of a hurry to be gentle with them.

Finally, I resorted to giving them "training wheel" charging cables: https://www.amazon.com/gp/product/B06WGMZY4H

I haven't had to replace a micro USB connector in years, now.

Similar cables are available for USB-C connectors, as well.....something to consider for the future, at any rate.
 
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AllanGH

AllanGH

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alphacoyle said:
Don't know why the industry is sticking with the micro usb when it's so fragile?
Click to expand...
Any connector is "fragile" if it's abused.

Honestly, I've never had a MicroUSB or USB-C connector fail on me. Then again, I'm a bit of a snit when it comes to knowing the proper orientation of the cable end for correct insertion, and using interface connectors gently.

My family members?
Not so much. They still break notebook power/charging connectors fairly often.
 
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