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. (more…)