So this video shows how to discharge lipo battery with the URUAV Lipo Discharger and how we can mod it to make that process faster.
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First of all yes I know the only right way to discharge a lipo Battery is to fly it.
But sometimes it can happen that due to bad weather or stress at work and or with the family and so on, you have full lipos and now you have to find a way to unload, and I finally found a solution that seems good to me.
Here you can find a full Tutorial with images https://intofpv.com/t-the-perfect-lipo-discharge-tool-mod-hack-diy
- description of the tool URUAV Lipo Killer Discharger
The URUAVUR4 Lipo Killer Discharger will discharge any lipo battery 1 to 6S
You can find it on Banggod link for about $6.80 in flash deal for the next few days.
The tool will discharge a lipo battery for storage Voltage and you can Adjust that.
The tool has two functions, the XT60 on the right is a 0 Volt Discharger this is useful for half-dead lipos after a crash and you want to discharge this 0 Volt before you can put it in the trash. (it takes about 24 hours for discharge lipo to zero )
The balance plug on the other side is the 4.0 to 3.0 Volt Balance Discharger 1-6S. (discharge lipo battery for storage)
Yes, you read correctly that it balances the cells and this is one of the great advantages compared to other dischargers on the market.
Another advantage is that once the URUAVUR Lipo Discharger reaches the final discharge voltage, it automatically shuts down without fan noise.
- how to hack / improve the unloading time - description
According to the description it takes about 5 hours and more for larger lipos and that's not really fast, safe and without noise, but not fast, so I was looking for a solution to shorten the discharge time. That's why I looked at how this tool works, I saw that the resistors on the bottom of the tool are separated for all 6 wires, always two of them. We can discharge a lipo with light bulb (G4 sockets and lamps) to improve the speed, but this time the discharge channels are switched on and off with electronics, so we have to be careful that the lamps don't overload the electronics, it worked with up to 10W light bulb without any problems in my previous tests.
With 10 Watt G4 lamps I have discharged a 1550mhA Lipo from 100% to below 20% (3.6Volt) in about 2 hours (you can see this in the video) with 5 Watt lamps, it took about 3 hours (also in the video). So we can say for the normal 3.8v memory voltage that it takes about an hour and a half or less with a 1550mhA Lipo and that's a nice speed, isn't it?
- What you need for the mod
one (or more) URUAV UR4 Lipo Killer Discharger https://www.banggood.com/custlink/DDGDpKjy6D
6x G4 light bulb 5 to 10 Watt 12 V (10x lamps included) https://amzn.to/2UYwYlD
6x G4 ceramic socket with cables (5x socket included) https://amzn.to/2I2vvr5
Optional my Designed 3D Printed frame thingverse link
With Amazon's packages you can build one 6S and one 4S Discharger or two 4S and one 2S and so on.
3a. How to build it
Building is very easy and is shown in the video around 4:38.
As described above, there are always two resistors in a row.
For each cell of your battery, the lamp leads are soldered to one end of the resistors.
Then plug in the lamps and you're done.
With the 3D printing it looks like this, but the design is not finally a work in progress any more better ideas are welcome!
danger and safety
First of all, take care of your lipos and always check them for damage, always keep an eye on the lipos and this tool and never leave them alone in the room.
ATTENTION THE LAMPS SHALL BE VERY HOT, DO NOT TOUCH YOU!
Use a smoke detector!
- How to Discharge a Lipo Battery for disposal
there are other ways but at the moment this is one of the easiest ways I found
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