Gregory's Servernow you see the trick. the first tabbed cell goes positive terminal down. the tab sticks out in the groove in the front. then the other cell gets arranged in the little trough that holds it at the correct angle.
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 i didn't grab a photo of me welding the solder tabs, but it's a similar process. lastly i put a length of heat shrink over the whole thing to hold it all together and insulate it. sadly the precut length of heat shrink is just a tiny bit short. oh well. quick fit check, and it works! these cells have a button on the end that is 1mm longer than the original, so i had to flip the battery pack around to get it to fit.  @tubetime ..yeah, I had to do the same thing to replace the aging backup battery in my HP8665A sig gen. |
then i bend and mush the cells together after welding, and line it up for the last cell. the trough has enough room to support 2 cells.