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I don't think they put the charging circuitry into the JBL. They were aiming for a
lowest price marketing advantage. They have really made little effort to have the
JBL be rechargeable friendly. The power monitoring and control seems unable to
properly deal with the discharge curve of the common NiMh battery, used with the
AA form factor.
That said, one of the major advantages of the very easy user battery
replacement, in the JBL, is that you can carry an additional set of charged up
batteries for fast on the go replacement. You wouldn't normally want to charge
the batteries in the JBL. With an offline charger and an extra set of batteries,
you need never be without a powered up JBL, or be unable to use it to read
your books. Or, have it limited by the length of a cord.
Luck;
Ken
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