How To Charge A Tablet Battery Directly : Several Effective Ways

About: I”ve studied electronics back in the days in my high school. Today it is simply a hobby. More About FireSword »

Hi Everyone!

I decided to post my little projects here instead of my blog, so that they can reach and help more people. This is my first Instructable.

My friend brought me his tablet. The USB socket was not OK, probably broken by his son. The tablet makes a strange noise when you try to charge it, and my power banks shut down, which shows a bad short circuit somewhere.

The USB plug is so small, that even with a magnifying glass I can”t see a thing, everything is hidden, attached to the multilayer board. Hot gun does not help!

So I decided to use a charging board like this…

You are watching: How to charge a tablet battery directly

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Step 1: Using the Charger Board


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Question 10 months ago on Introduction


I have a 7″ tablet, I bought in 2012. My charger recently broke down, so I tried wiring up a replacement charger, but when I plugged it in, the tablet stopped charging. The tablet powers up, but won”t charge anymore. Did I fry something on the circuit board? And If so, how can I charge the battery? Thank you.


10 months ago


How long does it take to full charge the battery?How long can you use it?


4 years ago


like it. simple and good for me since I am a super newbie at all of this. my ladys phone is doing the same thing with part so I”ll try this.ty


4 years ago


I wonder if you put the charge circuit in parallel with the old circuit…

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It SHOULD continue to register a charged battery just like normal. If not, perhaps a set of diodes on the charge circuit lines would prevent residual voltage bleeding, and give accurate battery monitoring back? I THINK most tablets monitor actual battery voltage, so should read properly once calibrated with a full charge/discharge/charge cycle. As long as none of the monitoring traces have been damaged.

One of the circuit gurus may have a different opinion. but it is a place to start, if you want to try on the next fix.

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1 reply

Reply 4 years ago


Thanks for your reply. I thought devices monitor baterry status 0-100% by measuring the voltage – let”s say 3,2-4,2V , not sure. Perhaps they don”t do exactly that. At first I thought to put the charging in paralell, but I can”t see any free metal parts where I can solder. That is the reason I did not fix the original socket.

Besides, if I put it in parallel the short circuit which I observed will stop it from working properly.


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