Sorry i don’t want to turn this into a discussion about electrical safety but how the fuck can a 9v battery kill you?
If someone opens you chest and applies it directly to your hart it may kill you but other than that you wont even feel it on your skin.
Do you have any experience in this field or are you just SHOUTING random myths you heard somewhere ?
All I know is a oldschool doorbell with transformer can shock the living shit out of you. Personal dc experience I will never forget
My fave one was parafin base medication setting there skin alight from a drill.
Hope so or why do I know EU regulation on what the voltage brakes are between extra low, low voltage and high voltage.
As we on it
You got the backwards DC crams the musical AC more likely to stop your heart. Making AC more danger as heart stoping is a worse outcome.
Generally low frequency AC has worse effects on your body because of the continuously changing stimulation. Additionally the humans body has a capacitive component so there will be a higher current form AC.
Well if you know all this then you should also know that a 12s battery is completely safe to touch and even a 20s battery won’t kill you in our normal circumstances.
It’s great if you respect electricity but it also helps your confidence of you really know what’s going on.
If you are scared get a friend to watch and touch the battery you might even need wet or sweaty fingers to feel it but it relay does not hurt and is not dangerous. I like to try stuff out and in my Tests even 84v on small contacts is barely noticeable.
Of course it depends on contact area and your hands but in general you won’t have a giant contact area.
The golden rule of bullet connectors (all connectors really) is that the female pins going on the powered side. Females then get covered in heat shrink so that cannot conduct via the OD (and slightly past the lip). Now you can bang them around all day and they won’t short.
Assume you will confuse your connectors some day and design accordingly.
Ok 1 point for you 
When I started esk8 in 2015 it was common that many Lipos had 5.5mm bullets and the negative was always male and the positive female. You could wire as many lipos in series as you want without any additional connectors or a harness.
Furthermore I use only black wires outside the enclosures for aesthetic reasons (on every build). Having the negative lead as male bullet helps a ton.
The last lipos I’ve bought had useless XT90, I guess you know what I did 
It looks like a mess but now imagine the same setup with XT90 wiring, the so called enclosure would be double the size
I’m old school and beside helmets I love bullets 
Bullets are great… Until you reverse polarity and smoke everything! 
I like to think of anything that supplies power shouldn’t have anything be able to drop into it and short it, like xt90 for instance.
