Battery test at home?

I would assume you have a voltmeter or multi-tester.  At rest your battery should read 12.72v (fully charged) and if at only 50% S.O.C. will read `12.2v.  If it is much below that give it a 2 amp trickle charge for 24 hours and let rest for at least 3-4 hours.  Again, you should be at 100% S.O.C. or 12.72v and if it reads within 0.04v at day later, your battery is good to go.  If in doubt take it to an auto parts store and have them put a load test on it - then you will be certain if it is good to go or not.  Our oldest battery (12v Interstate group size 24 deep cycle) turned 12 years old in April and still gives us good juice as we boondock.  Our newer battery, a Trojan T-1275 is a heavy weight at 85 lbs but puts out 160 AH which is splendid and lasts quite a while.  We neither utilize solar or generator yet can go off grid for 6-7 days with these 2 batteries when night temps are in the 40's and furnace is running a LOT.

Thanks guys. my battery reads about 12.92v (I trickle charged a week ago), how do you interpret this reading? 

yeah, there is similar auto parts chain here in Canada called partsource that offers free battery load test, might pay a visit in the near future.