How to discharge a battery fast? A LiPo discharge device

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All (or almost all) modern battery chargers have a Discharge option. For all those cases when you want to discharge a battery at home. Useful stuff. However, almost always it’s limited to a relative low current. Max 1, maybe 2 amps. A bigger battery might take hours to discharge to a target voltage.
Some chargers, like Gens Ace IMARS DUAL have an option to use a External Discharge Device and increase discharge current. I’ve built such a device with a help of load resistors, wires, fan and brass sheet. And here is how it works.
0:00 The problem of a controlled discharge of LiPo batteries
1:09 DIY external discharge device
2:38 A quick battery discharge process
5:06 Additional notes
5:49 Summary

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Опубликовано:

17 июл 2024

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Комментарии : 25

@embededfabrication4482 Год назад

I've got one of those huge resistors for my VESC, they're cool! the ham radio operators put a resistor in a paint can filled with mineral oil to use as a dummy load.

@MCsCreations Год назад

Brilliant, Pawel! Fantastic work!!! 😃 We need more chargers with this feature! Stay safe there with your family! 🖖😊

@LaurentMontron Год назад

Very good, thank for the video

@mihavuk Год назад

Nice one, I'm still using 24VDC halogen car / truck light bulbs, 3 connected in paralell and pulling app. 180W. They do get hot too. But you can illuminate what ever you want during discharge. 😁 Ideal for small chickens maybe. 😉😁

@zappex92 Год назад

Best

@Mr.Laidukas Год назад

Peltier element is also a good option

@jurikristjouw Год назад

Nice vid and explanation of that feature, not well known, but afaik, that feature exists already on the iCharger back in the old days ;-)

@sgilb9471 Год назад

This seems like a pretty versatile solution. You could certainly add more resisters, perhaps in series/parallel combination. You could also add a female XT60 connector to the resistor bank, allowing you to daisy-chain multiple resistor banks. You could have a small one for modest needs, a larger one for higher power, and both for maximum power! One might also consider putting the resistors in a tub of water instead of using a fan. It should be safe at these voltages, and water can absorb a lot of energy, allowing you to run it at higher power.

@theflyingsandalrc Год назад

Interesting, I'll have to try this

@FPVUniversity Год назад

yup!

@michapeka2800 Год назад

Hmmm nice. You can use also empty large battery as load, or car battery

@primoziskra6394 Год назад

Some chargers (Junsi icharger) can not just discharge, but also charge battery conected to input. So instead oh heating resistors you can charge for example car battery. Or like I do use 6s6p liion pack to charge my batteries on field and sometimes discharge a battery back to field pack.

@UC3Music Год назад

I managed to discharge 2x22000mAh 6S in 25 mins with 1500W 12V RV water heater. Overheating is no problem since resistor won't get much higher than 100°C if you provide enough water. Just be sure to have more than 10L for every kWh of batteries.😂

@shaider1982 Год назад

Hope you can get an actual heat sink for those large resistors. Best would be to have a thermal engineer model it via CFD to check on best resistive-load cooling config but I guess that's waay to costly at this scale.

@FPVUniversity Год назад

Or just buy a used CPU cooler and adopt it a little

@rasmus80g Год назад

Discharge without balance lead is no good. Any charger that can do this with balance lead connected?

@primoziskra6394 Год назад

So you have balancer on your drone and battery connected to it? We usualy discharge lipo batteries only to storrage value. And yes this charger can of course also discharge with balancer connected.

@rasmus80g Год назад

@@primoziskra6394 no. If you look you need to use dc input port for discharge when using an external load. That port does not have a balance port.... yes it works... but I prefer to store my batteries balanced. Better in long run also charging next time will be quicker since charger does not need to balance the batteries while charging... so many advantages to store batteries balanced.

@kentuckyfrier Год назад

This looks like a cheaper option than halogen bulbs. A good idea though is to connect a voltage monitor on the balance lead while it's discharging. I have one that beeps loudly if one cell gets too low. I then storage charge up to 3.8v per cell.