
4 Manual Number 9019706 • Revision A, February 24, 2023
SECTION 1 GENERAL DESCRIPTION
1.1 INTRODUCTION
The TB28-12V and TB14 series Advanced Lithium-ion Batteries, part number(s) 6430014-( ), are
designed to deliver high current capability to start piston and light turbine aircraft engines and
successively provide DC power capacity to the primary electrical bus in the event of generator
function loss. The TB28-12V/TB14 are sophisticated energy storage and power systems that utilize
state-of-the-art lithium-ion iron phosphate battery cell technology which provides improvement in
performance, safety, life and weight when compared to traditional or competing aircraft batteries.
The design of the battery includes detailed focus on key electrical, mechanical and software
elements that combine to provide exceptional performance and safety that meets and exceeds the
latest regulatory and industry standards. The TB28-12V/TB14 are complete battery solutions that
provide significant value and benefit to an aircraft designer, owner and operator.
Key features of the TB28-12V and TB14 batteries include real-time state of charge and state of
health resulting in maintenance-free operation with on-condition end of life. Multiple safety
protections and continuous data monitoring add value, reliability, and reduced cost of ownership
for the life of the product.
The TB28-12V and TB14 batteries require professional use and minimal service to deliver
maximum performance and value as designed. This manual contains information related to the
specifications, installation, operation, storage, scheduled service and other related topics
associated with the proper care and use of this product.
1.2 PHYSICAL ATTRIBUTES
The TB28-12V and TB14 batteries include a single, integrated assembly contained in a metal
enclosure with positive and negative power terminals and a 15-pin D-shell communication
connector. The top of the enclosure supports the use of a hold-down bar for typical aircraft
mounting. There is a 1-inch diameter vent port on top of the unit for an exhaust connection that
directs any released emissions appropriately.
1.3 UNIT ARCHITECTURE
The unit is comprised of two primary functional pieces:
Battery module
BMS (Battery Management System) board; a printed circuit board assembly that serves not
only to manage the battery system, but also controls charging and discharging.
Each battery consists of sixteen (16) cells. The 14 VDC battery (p/n 6430014-1, Model TB28-12V)
cells are arranged as four (4) groups of four (4) parallel cells, connected in series (4S4P); the 28
VDC battery (p/n 6430014-2, Model TB14) cells are arranged as eight (8) groups of two (2) parallel
cells connected in series (8S2P). Both -1 and -2 batteries include multiple temperature monitors to
assure safe operation. The cells are inter-connected with copper busbars and then tied directly to
the BMS board.
The BMS board is a microprocessor-based system that monitors the battery functions and protects
against such conditions as short circuit, over-temperature, over-discharge and others. The BMS