bfields45
What the best setup for battery for external
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wolvenkinde
well you basically have 2 easy choices:   three 1.5volt alkaline batteries in series or a 3.7-3.8 volt(these actually read up to 4.2 volts when fresh charge) lithium-ion battery(or couple in parallel).  I use both in my builds.  I like the 18650 li-ion(2 in parallel) for decent life in a slightly smaller area than 3 Cs alkaline myself.  Just make sure you match up voltage however you go.  There are other ways to do it but more hassle/work than they are worth IMO(RC battery packs, regulators, etc).
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buckshot164
You can use another camera lion battery in parallel.  you can get one of those cheap chargers that the bed comes off of.  You can use the bed from the charger as your external battery holder.
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