p/n 725.0002 REV 3.0
© 2023 TCW Technologies, LLC.
8
is available a peak charging voltage of 14-15 volts will be observed as the battery reaches full
capacity.
Alternately, a ground based charger is available from TCW Technologies LLC., model # IBBS-12v-
CHARGER-LI-FE. This charger may be used for recharging the IBBS unit as well as keeping it fully
charged during long term product storage. (9 months or longer)
Battery Capacity:
The IBBS provides an energy capacity of 3 amp-hours at 12.8 volts when the system is fully
charged and operated at 25 C°. Depending on various conditions including operating and storage
temperature and age of the battery pack, the capacity of the system will vary. With a fully charged
battery, the following average performance can be expected in terms of operating duration. The
operating duration is for an output voltage down to 9.0 volts. (end point voltage). The battery is
also rated for at least 500 shallow discharge cycles, this is defined as a 10 minute discharge
operation at 3 amps followed by 30 minutes of recharge time.
Nominal Current Draw
Duration
Effective Nominal Capacity
Total connected load all outputs
1.5 amps
120 minutes
3 amp-hrs
3.0 amps
60 minutes
3 amp hrs.
5.0 amps
30 minutes
2.5 amp-hrs
Capacity at Low Temperatures:
-18 C° 75% of effective nominal capacity
-30 C° 70% of effective nominal capacity
-45 C°
45% of effective nominal capacity
Servicing:
The internal battery in the IBBS system is replaceable; however, the IBBS product must be
returned to TCW Technologies, LLC. for this service. The unit must be replaced with the same
Part Number unit or later FAA approved revision. Battery life depends strongly on many factors
including operating and storage temperature, number of discharge cycles and depth of discharge.
The battery capacity should be checked at least annually for suitable back-up power operation of
the connected equipment. When the battery capacity no longer meets the operating criteria of the
aircraft it must be replaced. Contact TCW Technologies, LLC. regarding battery replacement.
Storage beyond 9 months:
If the IBBS unit is to be stored without connection to the aircraft for a period greater than 9 months,
it must be connected to a source of DC power to maintain the batt
ery’s charge. Only conne
ctions
to the ground terminal and the main power terminal are required. Connect Pin 5 (main power) and
Pin 9 (ground) of the IBBS to any source of regulated DC power at 14-15 volts with a current
capability of at least 1.8 amps to accomplish full recharging. Ensure the IBBS unit is in an ambient
temp of 0-40 C° for ground-based charging. Charger model IBBS-12v-CHARGER-Li-Fe is
available from TCW Technologies, LLC. to simplify this activity.
