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In this video I will show you how to build a simple lithium battery protection circuit, so you can power your homemade projects without ever worrying about over discharging your battery.

How to use lithium batteries safely: http://www.maxamps.com/lipo-care.php

More info on battery measurements: https://www.youtube.com/watch?v=cxkVxi9P0EA

Items you'll need:

Alarm circuit: http://www.ebay.com/sch/i.html?_from=R40&_sacat=0...

Relay: DSP1a-L2-DC5V

http://www.google.com/search?q=dsp1a-l2-dc5v (select one of the distributors - price is around $5)

Music by Kevin McLeod and Löhstana David

<p>Am I able to use this DSP1A-L2-DC9v instead of the DSP1A-L2-DC5v and just tap into the 3s balance wire? I am unable to get a hold of the 5v in Canada without crazy shipping cost or is there another brand I can substitute. hope you or someone can help </p>
<p>Based on the original, this is a version of the<br>&ldquo;Battery Protection Circuit (low voltage<br>cut-off)&rdquo; that I recreated.</p><p>I am using two combined latching switch to create a nine (9) pole-latching switch, which can be<br>connected and successfully operate any 2 to 8 cell lipo battery. </p><p>The latching switch turns on/off the unit as<br>design. </p><p>Two protection circuits will be use as part of a lipo battery 2000 watt 1 ohm resistors discharger<br>system for medium to large capacity batteries<br>used in RC vehicle. </p><p>The prototype works well.</p>
<p>I have slightly altered the design to fit my needs, but it is basically the simpler version of the two</p>
<p>Wow, really great, just what I needed. Could you maybe link to all products used?</p><p>Is it necessary to use a 82 Ohm resistor or could I use a 100 Ohm one?</p><p>And what kind of push button do you use, as I guess it should be a momentary switch, but it looks like a latching switch?</p>
<p>Very nice! This is a handy item to have. </p><p>I've wanted a low voltage alarm for my rc planes, but never sprung to buy one. I'm guessing this could be modified fairly simply to trip a loud buzzer, rather than simply cut off power? </p>
the lipo alarm which is modified in this instructable beeps loudly when the trigger voltage is being reached. this instructable shows how to modify it so it doesn't beep anymore but instead cuts thr circuit. if you simply want an alarm but no circuit cut, just use the alarm behind the link.
<p>To turn the circuit off, wouldn't it be more simple to add a toggle switch between one of the balanced connectors and the monitor, so that when off, it would read 0v and trigger the &quot;alarm&quot; which in turn triggers the relay?</p>

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Bio: Hello! I'm Matt and I love making things. I'm always thinking of new ideas and how to make them as awesome as possible ... More »
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