Setting a Battery Level Meter.

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About: Update 12 September 2017: A very special thanks to Sam Elder, a manager here at Instructables, who tracked down the cause of my lost publications and fixed the issue. Take a bow Sam!

Intro: Setting a Battery Level Meter.

Here is a low cost led level meter for batteries. It's quite easy to configure and this is how it is done.

Step 1: The Battery Meter.

This useful meter is perfect to check the state of charge on any battery. To access it's internals, just pop off the back. Inside there are two potentiometers. One for hi value and the other for low value.

Step 2: A Bench Power Supply.

An adjustable voltage supply is necessary to properly setup the level meter.

Step 3: Setting the Hi Value.

The power supply needs to be set to the highest value expected of the battery. Using a precision screwdriver, the hi pot is adjusted until the blue led bar lights.

Step 4: Setting the Low Value.

The power supply set to the lowest acceptable battery voltage. The lo pot adjusted until only one red led bar is lit.

Simple, effective and low cost. Perfect battery meter!

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    7 Discussions

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    dailodai78

    1 year ago

    Could I just turn the pots and do a trial and error since I don't have an adjustable voltage supply?

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    Amazon.com. Search for led battery meter.

    https://www.amazon.com/gp/aw/d/B00N93XNB8/ref=sxl1?ie=UTF8&qid=1468160495&sr=1&pi=AC_SX236_SY340_FMwebp_QL65

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    medwards38

    2 years ago

    ps. his title to this was 'setting a battery level meter'
    i believe that is what he instructed us on yes?

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    medwards38

    2 years ago

    instead of writing insulting posts - use your noggin and do a quick ebay search for "battery led level meter"
    took me less time to do that than it did to write this reply to you, but i feel its worth pointing out your lack of self initiative
    heres a link to one -
    http://www.ebay.com.au/itm/331820149987

    thanks for your instrucable Mj - i have one on order as we speak - i just finished a repair and mod of an electric scooter and was looking for a simple way to track the power i had left in the batteries while in use -solved my problem thank you!