Except for the battery differences, the JB and JBL are very similar; someone else will have to chime in with more details. For me, the ability to be able to field change batteries in my JBL using non-proprietary batteries is a huge advantage. If my JBL batteries go dead while, say sitting at a restaurant table, I can swap in another set in minutes. With a JB, I would have to wait until I could find a power source, then wait several hours for the battery to charge. One can always use rechargeable batteries in the JBL. I already carry a bunch of Sanyo Eneloops (AA and AAA) in my purse (and more in my luggage when I travel) to feed my electronic goodies so I always have a supply on hand.
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