[TenTec] Battery Needed

[Stuart Rohre]

If you search for the battery by its voltage and amp hour rating, which 
you can calculate from your load requirement; you can find it by Google 
search.  Given what you told us, you need at least 4.2 AH rating, so 
lets' say a 5 or 7 amp gel cell, as I know 7AH gel cells are common in 
alarm applications.  You don't want to pull a cell down all the way, so 
figure you will only pull 80 per cent of the available current and time.

Enter in Google "12Volts DC, 7 AH"  in quotes, and see if it leads you 
to a specification sheet.  Or simply look up "Gel Cells" and read the 
manufacturers catalog data sheets and notes on max load you can pull 
from a given size.

Always pick a size larger than your exact requirement for best life.

-Stuart Rohre
K5KVH