Problem: A few old 90’s alarm key fobs use 6 volt batteries made up of 4 separate 1.5v button cells. Last year I needed one quick-like – same day – for the Golf Mk3 I’d just bought. There are plenty online, eBay etc, for about £5 to £10 but I couldn’t wait 2 days for one.
Solution: Nipped down to the Pound Shop and bought an assorted selection of hearing-aid button cell batteries for a quid! Taping four AG3’s together with Sellotape or Electrical Tape didn’t make a good enough electrical connection between the cells. Turns out a piece of Heat Shrink tubing, placed over all 4, then gently shrank (shrunk?) with a lighter forces the cells together nicely! After this is done, trim the top and bottom of the tubing to make sure the battery contacts are able to make connection.
Longterm Use: I’ve been using this solution for a year and the batteries have just run out. I was using 4 AG3 type button cells, but any 1.5v types that are small enough to fit in the Key Fob case would be fine. This time around I’m using a ‘proper’ one from eBay – part 4/393 – as I had more time to order it.
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