Apply DC to water for a while and you get acid that eats PC boards and any thing .
Working with light current my whole life i have seen many bubbling messes when DC and water mix it eventual starts to bubble and go green if there is any copper in the mess.
IMO it is the bandwidth , i connected two 410s to my NVR and it bogged down the system ,the 410s run on H264 which is a bandwith hog on my NVR .
Disconnect one or two 410s randomly and see what happens .
Replaced the 410s with cams running H265 and all was good .
Just get the correct charger for the job .
I use one of these for LA and Lipo .
https://www.takealot.com/blue-smart-ip65-battery-charger-12-5-230v/PLID72805894?gclid=CjwKCAjw7eSZBhB8EiwA60kCW3bIQLJ-FYrzg_hMKFYq4a1IXUMH_Nov0AJBvXxuLLJwgPw5RLXWgBoC_XgQAvD_BwE&gclsrc=aw.ds
Charge Voltage...
I have one of those units running my security gate lock with a Bluenova 8Ah battery in it and it runs for more than 8 hours , adjusted the voltage to 13,8V , it works well .
I agree. This kind of energy hitting a human body will certainly kill you .
750 gr (49 g) Hornady
2,820 ft/s (860 m/s)
13,241 ft⋅lbf (17,952 J)[2]
800 gr (52 g) Barnes
2,895 ft/s (882 m/s)
14,895 ft⋅lbf (20,195 J)
I have , it runs the kitchen and a bath .
The kitchen is a bit busy and the bath is used once a day by the SO it just works , i have had it for about 18 months 9KG lasts about 3 to 4 months .
The pomp and ceremony , changing of the guards Etc. brings in more money than all our mines put together.
It is all about tourist money .
The perpetual show that brings in huge amounts of money to the UK.
https://www.visitbritain.org/visitor-economy-facts
I have three bluenova 8AH batteries and no problem with them i use them as LA replacements .
The BMSs definitely works because i charged one with a normal LA battery charger and the BMS switched off when it was supposed to .(i have since acquired a suitable charger )
I have seven rescue dogs and what they do in my yard is may business as long as they do not bark incessantly .
Tell your neighbour to go get knotted .
I have a 4K camera system round my place most with microphones so i know what is going on and can check what happened if any thing happens .
I have two of these , the AI for the person detection definitely works .
They are not cheap , i paid about 3K each landed from Aliexpress (no false alarms in six months so far).
The siren wakes me up and then i take care of business ...
Never used it still sitting in the cupboard .
I think this is what OP is describing .
https://www.aliexpress.com/item/1005004122666085.html?spm=a2g0o.productlist.0.0.cd425d59TCgUvc&ad_pvid=202208040309314967384474419440007303887_3&s=p