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BEFORE YOU START
Make sure to use the soldering iron safely:
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DISCLAIMER:
Our pictorials are of informative nature and do illustrate works carried out by ourselves at our own premises for our own use and satisfaction.
Readers who envisage to carry out similar works inspired by the below method shall do this at their own risks and liability.
Our pictorials are of informative nature and do illustrate works carried out by ourselves at our own premises for our own use and satisfaction.
Readers who envisage to carry out similar works inspired by the below method shall do this at their own risks and liability.
NOTE: the below shown battery replacement tutorial occurred on a 7" Polaroid tablet but works are identical on any Android tablet, as long as the back cover is simply clipped to the tablet case, thus the battery replacement does not require the removal of the LCD screen.
Other tablets including Amazon Fire, Samsung Galaxy, etc. would require the LCD screen to be unbonded first, which is not shown here.
Other tablets including Amazon Fire, Samsung Galaxy, etc. would require the LCD screen to be unbonded first, which is not shown here.
Opening the Android tablet and diagnosing the lithium battery
You need first this little tool to be able to open the tablet.
It is a common tool used to open mobile phones and small tablets that are only assembled by pressing the back cover to the LCD screen frame.
It is a common tool used to open mobile phones and small tablets that are only assembled by pressing the back cover to the LCD screen frame.
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Buy your phone and tablet tools from our partners' stores:
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Insert the tablet opening tool between the two parts of a tablet:
Do not tilt it as this will break the opening tool, just move it in between the two shells of the tablet case.
- The LCD screen frame
- The tablet back cover
Do not tilt it as this will break the opening tool, just move it in between the two shells of the tablet case.
Open the Android tablet case.
This now shows the back of the LCD screen, the motherboard and the battery in silver.
This now shows the back of the LCD screen, the motherboard and the battery in silver.
Test the battery lids with an multimeter and compare to the voltage shown on the battery (3.7V).
Note if the multimeter shows 0V which clearly signals a dead battery.
A fully discharged tablet battery should still show a positive voltage reading that is close to its nominal voltage.
Note if the multimeter shows 0V which clearly signals a dead battery.
A fully discharged tablet battery should still show a positive voltage reading that is close to its nominal voltage.
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How to select and buy a replacement battery for your Android tablet
You need to buy the right replacement battery, of the closest match to the one in your tablet:
- same voltage (3.7V in this case)
- same capacity: 4000 mAh in this case. In case you don't find a matching capacity, you can still buy a lithium battery with a lesser or higher capacity within a 25% range and try. This does not guarantee however that it will charge properly or that the battery status indicator will show the right value, so always stick to the original capacity.
- same or similar size. The size is indicated in mm, in this case 3590125 which means 3.5mm thickness, 90mm width, 125mm length. If you don't find the same size, make sure to buy a new lithium battery of the same thickness as this is the dimension of the highest constraint since a thicker battery won't allow you close the tablet case.
Buy your tablet battery from our partners' stores:
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How to fit a new battery on a 7" Android tablet
Use your soldering iron to quickly unweld the battery terminal wires then a cutter knife to cut any tape that holds the battery in place.
Be careful when using the cutter since the tape holds the tablet battery to the back of the LCD screen. Do not apply any force on the cutter blade, just let it slide on the tape.
Be careful when using the cutter since the tape holds the tablet battery to the back of the LCD screen. Do not apply any force on the cutter blade, just let it slide on the tape.
Now comes the most difficult part since the tablet battery is still held in place by a strong double-sided fixing tape.
Gently start by bending the battery until you see the tape which you need to cut with the knife.
You might feel a smell of fruity bonbons when tearing out the tablet lithium battery.
Wash well your hands once you're done.
Refit the new battery after changing the holding tape and weld its wires to the board.
Make sure the wires are properly passing next to the battery prior to re-closing the tablet's case.
Close the tablet's case by pressing firmly the two shells until you hear a "click" on each and every fixing leg.
Make sure to fit the speaker and camera at the right place when doing so.
Gently start by bending the battery until you see the tape which you need to cut with the knife.
You might feel a smell of fruity bonbons when tearing out the tablet lithium battery.
Wash well your hands once you're done.
Refit the new battery after changing the holding tape and weld its wires to the board.
Make sure the wires are properly passing next to the battery prior to re-closing the tablet's case.
Close the tablet's case by pressing firmly the two shells until you hear a "click" on each and every fixing leg.
Make sure to fit the speaker and camera at the right place when doing so.
Your tablet might restart immediately after welding the battery wires.
Do not use it yet, let it completely discharge the battery instead by changing the settings and forcing it to remain ON.
Once it turns off, start charging it and make sure the battery charge indicator is moving.
Place the tablet on a non-inflammable surface and keep feeling the battery temperature with your hand from time to time.
The tablet's lithium battery should be warm only during the charging process i.e. you should remain capable of keeping your hand on the back of the tablet even after a few hours of charging.
That's it.
Do not use it yet, let it completely discharge the battery instead by changing the settings and forcing it to remain ON.
Once it turns off, start charging it and make sure the battery charge indicator is moving.
Place the tablet on a non-inflammable surface and keep feeling the battery temperature with your hand from time to time.
The tablet's lithium battery should be warm only during the charging process i.e. you should remain capable of keeping your hand on the back of the tablet even after a few hours of charging.
That's it.
See also our other tutorials in relation with laptops and cameras:
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