Self-taught repair, ep. 260: a follower brought a vacuum cleaner battery for reassembly, the cells were done and he bought 6 himself. Cut off all the leads and nickel, but not from here — that part stays, there’s no matching part and it still has to be welded again; new cells laid + − + −; they need double-sided tape or they keep shifting, the original had glue too; + and − stuck down; a fish paper ring on every one; cut nickel, one, two, three is enough; ‘soldering iron’ — no, a spot welder, went with the high-power AWithZ and just go hard; power turned up a bit to 67, fine; one weld done, beautiful; he likes a few extra welds so it can’t come loose, two or three would really do; these two are the main − and main +, the rest you weld without thinking; don’t weld those two yet, put it in the case and look first; weld the board legs on directly without removing them; power is a bit high, can’t run it high or it burns through underneath, down to 40 and try again, fine; some welds crooked; weld the remaining + and −; cut the nickel shorter; really, 40 was enough, turned it up too far before, ‘too young, life hasn’t beaten me yet’; at this power the welds are just right, it kept sparking before; assemble, connect the NTC/B2 board and weld; nickel a bit wide, trim; success, beautiful; fish paper insulation, both sides in one go; back in — he took it apart himself and doesn’t know how it goes; + and − leads must not be swapped, swap them and it’s dead, M+ is red; 4 screws; charge to wake it, shows charging; unplug and it starts; a video for the customer, nailed it. 35 comments: always cheerful (6); no need for rings on the negative (3); not the original Dyson board or it would have locked long ago (2); got one backwards again (2); can batteries be posted; how much; how much is the welder; six in series 25V; the insulation is secondary, mostly to hide the mess.