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Author Topic: ISDT FD-100 smart lipo discharger 2-8S lipo up to 80W discharge  (Read 2280 times)

jamesb72

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ISDT FD-100 smart lipo discharger 2-8S lipo up to 80W discharge
« on: October 18, 2017, 12:17:47 PM »

I've struggled with lipo discharging for storage, using various light bulb rigs does the job but you have to be careful both to monitor voltages with various meters and beepers, also to not melt the tablecloth/carpet !

Saw this 80W discharger a couple of months ago on Banggood, so pre-ordered it and it came on Friday and works well, discharges <3S lipos at 6Amps, max current drops at higher voltages (6S around 3.5-4amps) but still much easier to use than light bulbs - and safer. Most chargers only discharge at 0.5amps so take forever, and puts heat/wear and tear on charger so this is much more practical especially for larger packs.

It has an XT60 input and two buttons to select cell count and max current, discharge slowly ramps up at start, and looks to ramp down again as target voltage of 3.8v/cell is reached, it then beeps when finished so you can swap over. It has a cooling fan on a thermostatic switch so keeps itself under 40degC which is warm to the touch, certainly better than the light bulb rigs!

My early cheap lipos I never bothered with discharging if I'd charged and not been able to fly, and they definitely deteriorated over a year or two, the more expensive 6S 5000mah lipos I have religously discharged if unused for storage, also the high C miniquad packs, and these have definitely lasted much better still rock solid and decent IRs even after a few years and 50+ cycles, so definitely worth looking at if you have high cost or spec lipos to look after.

Quick video review here:
https://www.youtube.com/watch?v=l3Jar3fdBOw

« Last Edit: October 18, 2017, 12:22:12 PM by jamesb72 »
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English Turbines

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Re: ISDT FD-100 smart lipo discharger 2-8S lipo up to 80W discharge
« Reply #1 on: October 18, 2017, 11:11:49 PM »

  I have 3 ISDT Chargers and balancers and I really like them.  However, what bothers me about this is that it's not monitoring individual cell voltages via the balance lead, which seems rather naive to say the least?

 There are also a number of similar discharge products which use  halogen bulb loads which are smarter and do monitor cell voltages and are considerably cheaper. Not as pretty as the ISDT product, but definitely smarter IMO.
  You end up with all cells sitting at 3.80 volts or you can in fact adjust the terminal voltage how you want it to be, which makes it considerably more flexible. ISDT seem to have dropped the ball on this product by making it too simple...?

        Be interested to hear some other opinions on this as Im not an electrical engineer so I may be talking bollux....lol

                                                                                                :vulture:
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atomiclama

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Re: ISDT FD-100 smart lipo discharger 2-8S lipo up to 80W discharge
« Reply #2 on: October 19, 2017, 08:23:04 AM »

I'm with you on this.

Made that point as well over on MR
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SnoozeDoggyDog

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jamesb72

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Re: ISDT FD-100 smart lipo discharger 2-8S lipo up to 80W discharge
« Reply #4 on: October 19, 2017, 09:30:29 AM »

I bought one of the 3in1 150w halogen dischargers a while back, but haven't got round to mounting the bulb holders on anything to use it safely - and I still don't fancy running lightbulbs on the table as I would get shot if the tablecloth melted !!

I believe the ichargers have the best discharge capacity as you can tie in external loads (lightbulbs or resistor packs) but I've never got into them, but I figured that would be the way to go for cost effective high current discharging.

If you want to monitor individual cells during discharge, you could plug in one of the cheap lipo beepers which will beep when any cell drops below your choice of voltage you can set these with a button so it beeps when lowest cell reaches 2.7-3.8v as preferred - I have a few of these they are only a few quid and well worth having. They are very loud but for indoor use a bit of tape over the horns will mute them to comfortable indoor volume levels:



I still don't see a need to monitor individual cells when discharging though, we don't monitor individual cells in flight (and discharge at much higher currents), and chances are if a cell is much lower than the others you'd know it was a duffer already (as it would lose punch and probably be swelling) so it would be enroute to the bin.

Also if 6Amps/80W isn't enough I reckon you could make up a simple Y lead and run two dischargers in parallel - obviously much simpler without balance leads to deal with.

There are some very fancy discharge rigs available from West Mountain Radio which do cell monitoring, PC graphing and much higher loads (up to 2000W) but the cost is eye watering 199 gets you 150W, and the 500W and 1000W amplifiers go up and up ! - http://www.westmountainradio.com/cba.php

« Last Edit: October 19, 2017, 09:40:03 AM by jamesb72 »
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SnoozeDoggyDog

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Re: ISDT FD-100 smart lipo discharger 2-8S lipo up to 80W discharge
« Reply #5 on: October 19, 2017, 09:45:33 AM »

I just dangle the bulbs a safe distance from the workbench and gaffer tape the wires to the bench.

P
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Morganan

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Re: ISDT FD-100 smart lipo discharger 2-8S lipo up to 80W discharge
« Reply #6 on: October 28, 2019, 12:21:46 PM »

I originally wanted to buy a charger like this for my 6s 5000mah lipo. It seems that I have to think about it again.
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