Rev A, April 29, 2014 6 of 27 Manual Number 9018041
SECTION 1 GENERAL DESCRIPTION
1.1 INTRODUCTION
The TB44 series Advanced Lithium-ion Battery, part number 6430044-( ), is designed to provide high
current capability to start turbine or piston aircraft engines and subsequently, provide DC power capacity
to the primary electrical bus in the event of generator function loss. The TB44 is a sophisticated power
system that utilizes state-of-the-art Nanophosphate®lithium-ion battery cell technology which provides
improvements to the performance, safety, life and weight when compared to traditional or competing
aircraft batteries. Consideration given to key electrical and mechanical design principles provide
adherence to regulatory standards and meet or exceed industry expectations. The TB44 is a complete
battery solution that provides significant value and benefit to an aircraft designer, owner and operator.
The TB44 requires professional use and maintenance to deliver maximum performance and value as
designed. This manual contains information related to the specifications, installation, operation, storage,
scheduled maintenance, and other related topics associated with the proper care and use of this product.
1.2 PHYSICAL ATTRIBUTES
The TB44 is a single, integrated component contained in a metal enclosure with multiple interface
connections. There is a primary 2-pin, industry standard military-specification power receptacle, an 18-pin
circular communications and service connector, a 4-pin circular temperature monitoring connector and a
heater enable push-button with LED indicator. The lid of the enclosure includes two hold-down features
on either side to support typical aircraft mounting. Handles on each side provide ease of lifting and
carrying for installation, removal and transport. There is a 1.50 inch diameter vent port on top of the lid
to provide an exhaust connection for directing any released emissions in the rare event of a battery
failure.
1.3 UNIT ARCHITECTURE
The unit is comprised of two primary building blocks: the Battery Modules with integrated Module
Management System (MMS) and a Central Monitoring System (CMS). Additional components include
power and communication interconnects, heaters, temperature sensors, container and hardware.
Each Battery Module consists of eight (8) cells, connected in series, with the MMS electronic protections
and battery control logic contained within each module. There are 19 modules arranged in three banks,
all connected in parallel through a network of bus bars to provide combined power to the main connector
and thus the aircraft. There is an integrated heater in each module as well that improves cold weather
performance below 0°C.
The CMS monitors individual signals provided by each MMS and reports status information to the aircraft.
It also employs hardware to manage heater functionality, and software for diagnostic information and
storing data that contains operating information.
There are two Resistance-Temperature Devices (RTDs) in the unit that provide analog electrical signals
through the 4-pin connector for independent temperature monitoring.
