Power bar for DC components

I would appreciate how-to info for building a battery powered bar for a chip amp and Arcam rDOC for power outage days. Does someone build a a small 2 outlet power bar from an auto or motorcycle battery to power these items? Thanks in advance.
No, not really, but the parts you need to build one are all off the shelf plug and play units. Just go to an RV store or Auto parts store and purchase the following:
1.a 12 volt battery with decent cca's
2.a 12 volt to 110 volt adapter (buy the expensive kind)
3.a 110 volt, 12 volt battery conditioner/charger
4.hook every thing up.

tweak this formula as necessary but that's the basics.
I hope I helped,

Synesthesia Studios