3.3
Using the optional external battery pack
The ST300 series products support the connection of an external battery pack. Connection of the
battery pack is straightforward. First fit the battery pack with 3 x fresh D cell alkaline batteries,
carefully ensuring correct polarity.
We strongly recommend using Energizer brand batteries
. Advertised endurances are based on this
brand, and performance of other brands is unknown. Most importantly, Energizers are guaranteed
not to leak electrolyte when left in a discharged state. Other battery brands may leak, possibly
causing damage.
Before opening the housing always check for flooding by shaking the recorder and listening for water
sloshing around inside. If flooding is suspected, then be aware that the housing may be pressurised
and therefore potentially dangerous. Carefully relieve any pressure by opening the small seal screw
at the base of the housing.
Before closing the battery housing ensure that the o’ring seal is perfectly clean, free from nicks or
other damage, well lubricated and properly seated.
Generously apply silicon o’ring grease on both
the o’ring and the tubes sealing surface.
Close the housing by screwing closed by hand until the
shoulder snugs up against the titanium tube. You may choose to use a lever arm (e.g. screwdriver)
through the holes provided top and bottom. However difficulty in screwing home the cap may
indicate insufficient o’ring lubrication; do not apply excessive force –
instead correct by applying
o’ring lubricant.
Fit the supplied cable between the battery pack and SoundTrap, using the supplied plastic collars to
lock the two connectors. The cable should plug in without effort. Where it is difficult to insert it is
important to lubricate the connector with silicon grease or spray.
Verify the supply of power from the external battery to the SoundTrap. Do this by
pressing the ‘BAT’
button on the IR remote and observing the SoundTrap’s red status LED. If all is well you should see
two long red flashes. Note that there is a 10 second delay between connecting the battery and the
software determining that the supply is stable. Observation of the two long flashes is confirmation
that the external battery is available, has viable batteries, and is ready to go.
A single short red flash indicates a problem. In this event, disconnect the external battery and
inspect for correct battery insertion and adequate battery condition.
