I have used one of the spares as the 12 volt battery for the accessories. To fasten it I bought some 6mm threaded rod (600mm zinc plated for $2 from Hardware and General) .
I cut it to length and bent about 30mm on one end 90 degrees. The bent end goes through a 6mm hole drilled in the base where the original battery went.
The battery is sitting on a rubber mat. The threaded rod and the hold down clamp are covered in heat shrink to prevent any possible abrasion.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhi1fo-mAJQmXbP87mSZ56KshOHp8cBeQSBen7rAkEWpkwdTYVErDfN8TU_VdNVRYjQsw92vJjD6yP0PdyAsiJly3l5jpLR5BzO2bL3Y43wOmk3sjkVr5d97KbBtM763V9pSGwkMjVGJhU/s320/23112008(002).jpg)
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