The MacAlly JBox IP-A481 external 5V battery has a capacity of 3400
mAh, and adds 8 hours to the Microtrack 2496's recording time,
according to the Soundprofessionals web site, That's 475 mA per hour.
http://www.soundprofessionals.com/cgi-bin/gold/item/MAC-IP-A481
The battery in the Microtrack 2496 is a 3.7V lithium-polymer model
with a capacity of about 1150mAh. Many people report 2 to 4 hours of
record time with this battery, depending on phantom power settings and
LCD display. Using 3 hours of run time as a median, that's 383 mA per
hour.
So I think a battery pack composed of four 10.000 mAh rechargable D
cells plus the internal battery should power the Microtrack 2496 for
more than 24 hours.
Here's a link to a description of the Energizer Power-2-Go battery
charger. It uses 2 Lithium AA batteries to power a variety of USB
devices, including the Microtrack 2496.
http://taperssection.com/index.php/topic,85254.msg1154218.html#msg1154218
The electronics in the $20 Power-2-Go might provide the foundation for
a larger, more powerful external battery.
Best price I've seen for the Microtrack 2496 is at www.core-sound.com.
They offer a price of $259 to TapersSection.com forum members.
Gianni, please keep us informed about your project. There's a
need for an inexpensive audio monitoring system, particularly one that
records on a programmable schedule. (The Froglogger system is a
little too inflexible in its settings for recording times for my needs.)
--oryoki
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