The Duracell 600 has a 26ah battery in it, should give around 6 hours with a Loudbox Mini. That set up will out power and outsound almost every option you're considering. I've been using a battery powered Loudbox Mini for around 8 months now , on the streets, and it's a great amp for the job.
Answering another of your earlier questions, a guy came by with a fretless bass last week and ran it through my set and it didn't hiccup. I was amazed at how well the mini performs as a clean, loud bass amp.
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