12V deep cycle battery to power Trends integrated

That will work just fine, and should provide you with many hours of listening with a fairly efficient pair of speakers. What will you be using as as source?

Thanks for response. For source, I've found that a non-powered Wadia iPOD dock will work well with an iPOD nano or Classic. A generator will be run occassionally to trickle charge the battery. A pair of smaller KEFs will be used....no it will not be loud, but adequate.

To bring out the best, make your DC trunk at least 12 awg wire and place filtering capacitors close to the application. There are presoldered 100,000uf/35V Rubycon capacitor arrays for sale on eBay. One of the lowest impedance deep cycle batteries is the 94AH Enersys Odyssey PC2150. I use two of these in parallel. They will last almost forever if you keep them topped off above 12V and don't use their deep cycle capability often.