funny enough re hkc I just fitted a system (friend believe it or not) on a few gates on a small farm. no waterproofing like that test I did 5 yrs ago on my house. Still no issues and furthest gate is over 500m away
usually dusting terminal is from a faulty / cheap battery slightly leaking. You will need to clean the terminals up.
plus I think its Israeli not italian
set the input keyswitch and pulse type (enable the * modifier), then just use the switch dc output type on the source panel it will only then arm the other system not disarm