Electronics > Beginners
Please help with switch selection
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Zero999:
Going from the replies and information posted above, I've changed my position: this is a very dangerous idea. Even if the shock risk can be minimised to a safe level, there's more of an explosion and fire hazard. I wouldn't want a lead acid battery to blow up in my face, showering me with acid.
shanezampire:
I was just simply asking what that was on top the battery and what them wires coming across the back of the desk going to it was? I playing that video full screen on a 26" monitor I could see them clearly. I was just simply curious what it was. I never said it was fake. I believe and know a battery can explode. I have seen batteries explode before.

Believe it or not. I am taking in everything you guys are saying. I have been messing with electricity, electrical components, and stuff since I was maybe 7 years old. I have boxes and boxes of stuff I have salvaged over the decades in my shop. I have made may things what work and many thing that didn't. But I have learnt something and walked away with knowledge from the all. I know and hold the knowledge of only maybe 5% of each one of you here.

I like to learn, tinker, actually do things. Make things. I could be like one them millennials that sit in mom's basement all day, plays video games, eating Cheetos, thinking they know it all, and scared to go out in the real world and actually do and try things, but I at least came here to ask, listen to the smart and more educated people.

But in the end, I am a not build or wired that way. I am not raising my kids that way either. You listen to the smart people, the elders, people with collective knowledge, take advice, adhere to warnings, but don't be scared to actually do and try things.

In the end, I am listening to each and everyone of you, making adjustments, but I am still going to build this. I survived riding in the back of an open pick-up truck bed when younger, shooting bottle rockets out of my hand, riding a bike without a helmet, lawn darts, and the many other things that are all now taboo. With caution, I will survive this. I could die in a car accident tomorrow. I know safety and not doing stoopid stuff helps prolong your life but you cant be scared of everything. We are never guaranteed tomorrow.
Jwillis:
Lead acid batteries while being charged expel hydrogen gas that can cause an explosion.I know this first hand because it happened only a couple feet from my head.Luckily I had a hard hat on at the time and I was positioned in a way that shielded me from the full impact.Caused by near by welding.
That being said .The type of switch your looking for is a Multi Step Rotary Switch.These have been used for years in industrial battery chargers with 6 ,12 ,24 and 48  volt configurations without blowing crap up. You just need to know if its AC or DC and the total amps your working with. I don't think they come in a non-shorting (Break before Make) I've only seen Shorting. Good luck.
   
soldar:
Lead-acid batteries can release hydrogen and can explode with all sorts of chargers. The dangers of charging with capacitive drop are others.

I would only use capacitive drop power supply for very specific things with very low power consumption. I definitely would not use it to charge a battery. Especially when you can buy or make a battery charger for close to nothing. It just makes no sense.
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