I guess this must have been covered before but....
Is there any way of repairing the spot welded links on a Ni-Cad battery pack?
It looks like stainless so beyond my soldering ability. Screwfix drill with twin battery pack at £29.99 so not a major loss.
regards
I reckon it's the same material as the battery casing so can be soldered. If soldering direct to a Ni-Cad use a hot iron and do it quickly. Tagged cells are available as replacements to get round this problem.
Everything scrapped before it's worn out is a major loss. ;-)
The message from Tim Lamb contains these words:
Actually it's nickel. They're not hard to re-spot, though for a drill, which (compared to model aeroplanes, for example) is a low current device you might get away with soldering it together. You'll need to scrape the mating surfaces clean and use a large iron so it doesn't take so long that the whole cell gets hot and dies.
As for re-spotting it -
I dont know the details of the construction, but often one can simply insert some metal to conduct and wedge the cells together, no solder or weld needed.
NT
I did read of someone making a mini spot welder for this using some parts from a microwave, personally I just solder them together or send the whole lot to re-cell for a proper rebuild.
mrcheerful
IMO. If you need to use a large iron, you're doing it wrong. Get the cell scrupulously clean - 600 grit new bit of sandpaper - followed by scotch-brite type pad - also new, while wearing clean gloves. Now, hold the cell vertically, with the cell face horizontal.
Clean the very hot iron tip, and holding it horizontally, build up a bead of flux-core solder, and then touch it upwards to the cell. The last two steps should take under a second. The solder blob should be touchable in under 5 seconds. Then you repeat the process - after the cell is cooled - with a bit of tinned wire in between the hot iron with the solder blob, and the cells tinned patch.
In message , Tim Lamb writes
Nickel eh!
Thanks to all. I'll have a go a soldering mindful of the heat issues.
regards
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