# DIY Digital Battery Balance Monitor

**URL:** <https://community.electricforum.com/t/diy-digital-battery-balance-monitor/14346>\
**Category:** Do It Yourself (DIY)\
**Created:** [August 20, 2018, 5:36pm UTC](https://community.electricforum.com/t/diy-digital-battery-balance-monitor/14346 "2018-08-20T17:36:54Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Functional\_Artist](https://avatars.discourse-cdn.com/v4/letter/f/54ee81/32.png) [@Functional\_Artist](https://community.electricforum.com/u/Functional_Artist)\
**Post date:** [August 20, 2018, 5:36pm UTC](https://community.electricforum.com/t/diy-digital-battery-balance-monitor/14346/1 "2018-08-20T17:36:54Z")

</div>

I want to share a simple battery balance monitor that I have designed & assembled

It uses (2) digital voltage meters (~$3.00 ea.) & a DPST (dual pole single throw) switch (~$2.00)

> **[Mini DC 5-120V 3 Digital LED Voltage Voltmeter Panel 12V 36V 48V 72V Car...](https://www.ebay.com/itm/Mini-DC-5-120V-3-Digital-LED-Voltage-Voltmeter-Panel-12V-36V-48V-72V-Car-Battery/122117143903?ssPageName=STRK%253AMEBIDX%253AIT&_trksid=p2057872.m2749.l2649)**
>
> Input impedance: \>100KΩ. Display mode: Three 0.56" LED digital tube. Display color: Red/Green/Blue. We maintain the excellent service standards. Red version: DC5.0-120.0V.

Each meter is connected to & displays the voltage in 1/2 of the battery pack

So, if both meters display the same voltage reading  
…it indicated that the battery pack is “in balance”  
 ![SAM_1743](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/5/54ba02fb6aebd5c764fbc6360c4cf406b429eaf2.jpeg)

![SAM_1780](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/2/28fcf6833b4a9a1a79dab537fb518e351fea2203.jpeg)

 ![SAM_1722](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/d/dfb02aa08a98e3b490495dee23fa54a59239ffde.jpeg)