8
5.
Batteries and Charging
The HammerJack operates on 8 ‘AA’ batteries. For optimal performance and run times, we recommend
using high capacity (2300 mAh or higher) NiMH (nickel metal hydride) rechargeable batteries rather than
alkaline types. When you operate the HammerJack at extremely loud volume levels, the current demand on
the batteries is much more than alkaline cells can deliver. Consequently, the run time of these batteries can
be very short.
Battery run time is directly related to how loud you operate the HammerJack. Using both speakers at the
same time, rather than only the most appropriate one, will have a negative impact on run time. With one
speaker playing, expect 6 to 15 hours of run time, depending on the volume level. With both speakers
playing, expect 3 to 10 hours. Remember that very loud volumes are rarely needed as animals hear much
better than we do. All FOXPRO rechargeable battery kits are shipped with individual instruction sets that
pertain to their unique operations.
Your FOXPRO unit incorporates circuitry to terminate the charge current if high battery temperatures are
detected. Battery temperatures increase at the end of the charge cycle. If the temperature edges towards a
dangerous level (50°C/122°F) while charging, the charge current will be interrupted. The charge will not
resume until the battery temperature has gone down. Be aware that the HammerJack unit does not provide
any visual feedback indicating the charge status. You should not permit the charge to continue for more
than 10 hours under any circumstances! The batteries need to be recharged when the “Low Battery” LED is
blinking. The following list of cautions and warnings should be observed with any rechargeable system you
decide to use.
WARNING
Do not mix battery types! For example: never use NiMH rechargeable batteries in
conjunction with non-rechargeable alkaline batteries.
Never connect your HammerJack to an unregulated 12V system (i.e. automotive
systems, high current power supplies, etc.) Serious damage will occur which is not
covered by the warranty. The charge jack is intended only for FOXPRO
®
chargers.
Never attach an unapproved or a non-FOXPRO
®
charger to your HammerJack!
Damages caused by plugging unapproved charging devices into your HammerJack will
not be covered by the warranty.
GENERAL PRECAUTIONS FOR CHARGING
Never attempt to charge batteries that are not intended to be recharged! This
includes both Zinc Carbon and alkaline cells. The resulting damage can be serious and
will not be covered by the warranty. For maximum charge efficiency, we recommend
charging your HammerJack in temperatures ranging from 40°F to 85°F (5°C to 30°C).
Disconnect any/all accessory devices that may be attached to the HammerJack prior
to charging. This includes external speakers, auxiliary devices, and USB cables.
Make sure that the power switch is in the “off” position while charging.
Make sure that the rechargeable battery pack is installed in the HammerJack properly.
Connect the approved FOXPRO charger to the charger jack on the HammerJack and
attach the transformer to the appropriate outlet.
Remember that NiMH batteries self-discharge about 1% per day.
Do not leave charging batteries unattended.
Remove batteries from battery holder when caller will not be used for prolonged
periods to help prevent deep discharge.
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