Charge Tablet Battery Directly
So I bought my sister this Visual Land tablet about 2 years ago. Eventually both the mini usb and charging port broke off from the logic board as expected from a cheap product. So I have this nice idea of using the tablet as a car nav/entertainment system. simply get rid of the battery and push 5v via a standard cigarette light usb adapter or make one with some 5v regulators and done.
I tried resoldering the charge port. I get 5.23v on random points on the board but I get 0v at the battery with the charging port connected. I pulled the battery and tested the terminals on the board with the charging port connected no battery, 0v at the board and the battery alone is also 0v most likely dead and trash as it sat for 1.5 years in a shoebox untouched.
So I pulled out my homebuilt psu power supply and hooked up the variable output to the battery terminal on the logic board. When pushing 3.7v~ I can get the first splash screen to show up but the tablet shuts off right after. When pushing 3.8v any thing higher the first two splash screens show and android starts to boot but the tablet powers off soon after.
So i decided to risk it and pushed 5v directly to the board. It started up fine and booted into android normally except for the low battery issue and some heat coming from the processor. Maybe a heatsink and rigged laptop fan into the casing could fix that? It shut off normally as if it had a dead battery.
How much voltage doeas a generic android board need? Current?Does the board take 3.7v but since theres no battery it wont boot? How could I fake a fully charged battery? Or could I possibly flash a custom rom? Do you guys need more info? I could provide more pics
Note that the battery is a 3.7v 3500mah li-ion battery with only a positive and negative hookups. Also i took some tape and covering off the battery to see if it possibly had its own controller board. It did have a small pcb board but it seems that its only 'a transfer' board, it takes the power from this cloth like cable and passes it into the wire thru the pcb. Should I try to hookup 5v straight to the battery to test it out? Battery has 0v so it might be useless.
This picture says most of it: Mods for saints row 2.
I want to connect a li-ion battery charger directly to the 4S battery, without removing it from the phone. This white plug shown touches the back of the pins 1 and 4 on the battery connector.
Will this work, or is the path of least resistance away from the battery, which could result in a short circuit? I'm currently looking at the schematics to try and make up my mind about this.
Battery Reconditioning a Charge Tablet Battery Directly. Welcome to the Charge Tablet Battery Directly guide. Here we will show you how to recondition the batteries with step-by-step guides. Battery reconditioning is a simple skill that everyone can learn, no matter if you know nothing about the batteries. Buy products related to direct to battery usb charger products and see what customers say about direct to battery usb charger products on Amazon.com FREE DELIVERY possible on eligible purchases. My battery tried to charge itself, and I had a 'green and red LED' at the same time! Like this the battery drained very fast, even with a switched off tablet! It might work for tablet's with a dead charger circuit, without mods on the board. You can also try it on tablets with a bad working charging circuit, it might work.
(I do this because there is something broken in the phone's internal charging circuit that I have been unable to solve. And yes, that red sticker is a good clue :))
Here is the full setup. I kept the phone on while attempting, and I can confirm that it works. I have so far tested charging the phone from 10% to 30%.
This phone does not charge through the charging cable. I kept it in anyway because the phone does notice it being plugged in. I haven't yet tested leaving it unplugged while charging.
The white plug is simply two small jumper wires with a third empty jumper head (just the plastic) between them. The distance turned out to match perfectly with the pins on the battery connector. I taped all of this together with electrical tape, then also taped most of the pins so they wouldn't touch any other metal surface in the iPhone.
Those jumper wires are simply connected to the + and - terminals of a 4.2V/800mA battery charger, which has all of the important safety components.
I was also lucky to find a plastic piece that allowed me to strap the plug at just the right angle.
With this, I can keep using the water-damaged logic board and charge the battery without removing it every time.
Charge Tablet Battery Directly Charger
Is this a good question?
Comments:
Having thought about this, the worst thing that should happen is that I will power the phone instead of charging the battery. Does that make sense?
Yes, that will work as long as you realize that there will be no signal going to the charger to prevent over charging etc
Tablet Will Not Charge
Thank you for the quick reply, oldturkey03! The charger I use, a Hähnel Ultima II for charging camera batteries, stops before overcharging a removed 4S battery. I was guessing it did so by measuring the voltage, and it stops before the battery is completely full. Shouldn't it do so also if the battery is in the iPhone?
How To Bypass Tablet Charging Port
steven shad not your phone, just your battery:-) REad through the comments and answers you'll see that this was addressed. You have to prevent overcharging the battery whenever you modify this circuit.