Homemade 6v Conlog type alarm fob battery.

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.

Pics: Below you can see the homemade battery from top and bottom. Under there’s a pic of the ‘proper’ one.
Homemade 6v conlog battery from AG3 button cells - negative

Homemade 6v conlog battery from AG3 button cells - positive

6v 4-393 type battery that was originally fitted

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.

Please let me know if this post was useful with a click, be honest 🙂
Nope, not helpful...Yep, more useful than not! - +3 thumb, 5 overall.

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