Currently, there is some discussion  , pro and con,  on the RCU pattern forum about having a spark eliminator in line with the  arming "switch". Castle Creations has stated that the spark is " your friend " and that seeing it tells the user that the capacitors are doing their job.

Personally, I just scuff  the residue on my bullet connectors every so often , followed with  a shot of electronic parts cleaner.

 For  product info. , check  www.espritmodel.com/jeti-afc anti-spark-connectors-4mm-75a.aspx

(Credits to the RCU pilots who have posted)

I read here somewhere that a spark eliminator may mess with the controller's automatic number-of-cells sensing (a dumb idea in my opinion: I'd hardwire it).  If so, what size resistor could one use to do the desparking, yet ensure that the controller doesn't prematurely miscount the number of cells in the battery?

Sorry.  Castle ICE Lite 75 and 100.

10 ohm resistor will do its job well and quick, the problem is, that ESC can see full voltage and thus start its work while it is still connected with resistor ... for example beeping will make voltage drop and it can confuse ESC and it can think that the battery is discharged

proper and technically clean solution is ESC with slide switch which can cut internal 5V source ... it is also safe, because BLDC ESC simply cannot start motor if processor did not start its work yet

and I also do not think that spark means ESC is not confused and that capacitors does its job, because spark means that connector does not vave good contact yet, so voltage on capacitors can be still variable, so I do not understand that statement from CC very well

however solution with two connectors (one with resistor and the second direct) is certainly not very good, and may be that reason for that statement from CC, bceuase it takes long time untin ESC gets good connection to the battery, much better is one female connector with resistor connected paralel so that the male connector must touch firts resistor and then immediately directly to connector, I hope that software of CC is not so quick that it can react earlier than connectros are connected directly

I do not know arming procedure of CC, but I hope that they do not arm before ESC gets proper "iddle" signal for some time, so solution can be also slide switch on +5V wire to the timer, so that the timer cannot send iddle signal and ESC cannot arm while connecting battery, but only when the slide switch is  ON , means when the battery is already well connected

Thousands perhaps millions of times a year a lypo battery gets hot plugged to a speed controller in the world.  Unless you are dealing with a 50V to 100V battery system I can't see the problem.  3 to 4 cell lypo setup no problem for sure.  10 to 20 cell setup might have special considerations.

Just out of curiosity what is the concern?  Damaged to the speed controller? Or perhaps damaged to the arming plug?

            

Where do the 10 ohm resistors go?

I have been hoping that you would get sufficiently annoyed at existing controllers to start making them yourself.  Sounds like progress.

Where do the 10 ohm resistors go?

I have it in female connector ...

Perhaps a two arming plug set up.  First plug has resistor.  Second plug has dead short.  Requires operator to plug up correct one first.  Also requires removing both plugs to disarm.  Plugs could be tethered together so that a tug on the tethered would remove both.