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I replaced 12x 12v batteries in my UPS stack this weekend and ONLY insta-welded two connectors.
(lemmy.world)
I see this as an absolute win. Be careful, folks. Just because it's DC doesn't mean it won't cause serious damage.
Edit for Clarification: When done correctly, the batteries should not arc. My problem is I did not wire the array correctly the first and a-hem second times. It only cost me one battery, which is a lot cheaper than a trip to an American ER.
Hm I have not heard about such an issue so far but I also don't have as many UPS as you.
I see you holding a red cable which could be +. When I switch UPS batteries, I do it the same way as it's recommended for car batteries to avoid sparks/arcs. Remove - (black) first, as it won't spark/arc. Then remove + (red) as it can't get a circuit closed any more, so also no spark/arc.
When plugging a car battery in, it's the other way around. + (red) goes in first and only then you connect - (black) to avoid spark/arc for both connectors again that way.
Oh no. Half of this post is me making fun of myself. Mistakes were made. When you have a large array of batteries, it's important to wire them up correctly when replacing them. I definitely closed the circuit on some of the batteries when I shouldn't have.
I see how it could be confusing, and in the spirit of sending the correct message, I have added a clarifying edit.