Then you would need a larger amount of voltage than the 1.5 volts generated per jar to create a sufficient conversion from high voltage to lethal amperage. That's about 6 jars per 9 volt battery, you'd be pretty hard pressed to fit very many of those in there.

Yes you could use it as a basic capacitor. With the inside storing one charge and the outside storing the other with the Acatia wood in between.

But seriously, why hell are you putting so much focus on what happened to that one guy who touched it and died? The Levites moved through the wilderness it a great deal and they were fine. Even the Philistines had no problems lugging it around.