p/n 725.0002 REV 1.4
© 2021 TCW Technologies, LLC.
7
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
55 minutes
2.75 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
-40 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. 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 battery’s charge. Only
connections 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.
