Introduction: Battery Level Indicator

Picture of Battery Level Indicator

Hi everyone, It's me Balsuryana!. I'am back with some electronics projects! In this projects, i will show you how to make a Battery Level Indicator.

I got this idea because i need this tools for indicate my powerbank battery level, so i made this tools. No more talking, LET'S MAKE IT!

Step 1: What You Will Need?

Picture of What You Will Need?
  • HT3786 (LCD drive power detection)
  • Battery level LCD (6 legs LCD) (Image 2 and 3)
  • 2 Ceramics capacitor (capacitor code: 104)
  • 220 uf, 10v Capacitor
  • Some cables


  • Soldering iron

Step 2: The Circuits

Picture of The Circuits

This is the circuits, you just follow this circuit. Please click the image for zoom the image and more visible.

  • C1 = 220 uf
  • C2 = Ceramic capacitor
  • C3 = Ceramic capacitor

Step 3: Solder the Circuits

Picture of Solder the Circuits

Before soldering, you can follow the circuits using breadboard, just insert the Legs to the breadboard, and you can modification the circuits. If you want to solder the circuits, you can use perfboard or you can make the pcb.

If you solder it without anything, it's look like image! :)

Step 4: Let's Test It

Picture of Let's Test It

If you finish solder your circuits, connect the negative and positive input to battery. This tools can turn on using less than 3 Volts. You can add resistor to the positive input, so you can use more voltage from battery to indentification more voltage battery level.

And thats it! this instructables is finish!

Thanks for look my works

I hope you like this

Please like, subscribe, share or vote this Instructables.

Thanks for look my works! :D


Sameerakhtari (author)2016-12-23

can we use other LCD like calculator lcd?

AnaG79 (author)2016-12-02

can it take 9.8 volts ? please answer

balsuryana (author)AnaG792016-12-02

It can. you just need to added the resistor to the input voltage

AnaG79 (author)2016-12-02

and if it does, does it take NI-MH ? please answer

pepy made it! (author)2016-10-18

thanks for the diagram,

I remembered my idea several years ago to use this display (on my cheap universal charger) as a battery indicator

balsuryana (author)pepy2016-10-18

Thanks for look my works. :)

0zzy (author)2016-10-16

Looks like all the components you have used are second hand as I can see the old tin still on the legs of your components ?
So I think you just used an old one and took it apart just to rebuild it out of the box it originally came in

balsuryana (author)0zzy2016-10-17

before i take the image and upload it to Instructables, i am test the circuit first and its works, so i unsolder again the circuit. after that, i go to take the picture and i solder it again.

Thanks for look my works:n)

donw1948 (author)balsuryana2016-10-18

hahahahahahahahahahahahahahaha ... right

donw1948 (author)2016-10-17

balsurana - Ozzy called it correctly - what vendor / store would sell such obviously used parts.

zeytin (author)2016-10-14

thank you wery clear connection

danpitak (author)2016-10-11

This is compact and easy. But I don't know why I could not find the HT3786 datasheet in English, there's only in Chinese. Do you mind to share it if you had it already? THANKS.

balsuryana (author)danpitak2016-10-11

No, i talk with seller in electronics store around me. And the seller recommend me to buy the LCD and all of the components and he talk to me how to make it. so buy this and the seller give me all of the component. so i make it and upload the steps to my Instructables.

BTW, thanks for look my works:)

RobertC2 (author)balsuryana2016-10-14

Perhaps you could ask the person at the store to give you the exact part number for that LCD... Or maybe that person could do an instructable. After all, it seems to be his/her design anyway!

danpitak (author)balsuryana2016-10-11

Thanks for your reply, I think I'll do it soon.

balsuryana (author)danpitak2016-10-12

Ok, thanks for look and comments :")

balsuryana (author)balsuryana2016-10-11

*so i buy this

bgordon (author)2016-10-13

The hardware needed to make this battery level indicator is so specialized (i.e. the screen is not widely available at all) that the instructable is simply a teaser without any real way of making it! It is really a shame....

GO chispa GO (author)bgordon2016-10-13

bgordon (author)GO chispa GO2016-10-13

I also saw similar chargers on Aliexpress, but your link (and others I found on Aliexpress) sells the complete charger, and not only the LCD panel. It would be silly to buy the charger that you linked to and dismantle it to build the exact same charger which you just dismantled!

The bottom line is that before this instructable can be useful, a link should be given to buy the LCD-panels only.

balsuryana (author)bgordon2016-10-13

Hi bgordon, i get the lcd from electronics store around me, im not buy this online. So i dont know the link to buy the parts, sorry.

Btw,Thanks for look my works

bgordon (author)balsuryana2016-10-14

Hi balsuryana, thank you for the explanation.

Your work is great. I just wished there was a way to built the circuit! :-)

Keep up the good work, but maybe with your next instructable try to use components that anyone can buy. ;-)

balsuryana (author)bgordon2016-10-14

Thank you very much for your suggestion, thanks!

throbscottle (author)2016-10-13

I couldn't even find a normal 4 bar LCD bargraph on the 'net. I would love to know where your electronics shop got these parts from!

GO chispa GO (author)2016-10-13

БеловА (author)2016-10-13

What is the exact name of the display? Without this link, and to sell it, this article is useless.

AAndy (author)2016-10-13

there is a schematic, etc that Google Translate does well on for the 3786...

It's made for phone charger applications.

david.roseman (author)2016-10-13

Where do you get the LCD? I see 100s of "Battery level LCD" on google.

What voltage is this designed for? 3? What resistor do i use to change the input voltage, so I know it's correct? So much missing information!

About This Instructable




Bio: I love writing, I make video in MY UPLOADED VIDEOS channel in Youtube for my instruction, and i love making something.
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