ETX900

TSO Battery

The ETX900 is a tso battery from EarthX, Inc.. View the full ETX900 datasheet below including key specifications.

ETX900 shares its datasheet with ETX900-24, whose page lists every part number it covers.

Official ETX900 datasheet (PDF) — the source this page was extracted from.

Manufacturer

ETX900 Key Specifications

Parameter	Value
Certification	TSO-C179b, DO-311A, DO-160G
Cell Chemistry	Lithium Iron Phosphate (LiFePO4), 4 cells in series
BMS Part Number	BMS_DR (DAL C)
Cranking Duty Limit	10-30 seconds in any 60 second period
Capacity Equivalence	16Ah lithium equals 22Ah lead-acid usable capacity
Nominal Cell Voltage	3.3V
Fault Discrete Output	Current sinking, 100mA max, 1/4 inch quick connect terminal
Cooldown Reconnect Time	1-3 minutes
Fault Indication States	Fast flashing (2 s on/2 s off), slow flashing (5 s on/5 s off), solid
Nominal Battery Voltage	13.2V (full charge >13.3V)
Short Circuit Protection	>1000A
Over-Discharge Disconnect	Below 5% remaining charge (typically <11.5V)
Charge Current Blocked Above	16V (resistance increases above 15.5V, 2 s delay)
Battery Terminal Screw Torque	45 in-lbs
Maximum Charge Current Rating	80A
Maximum Aircraft Charging System Voltage	16V

ETX900 Overview

Part: ETX900-TSO-REVx — EarthX, Inc.

Type: Lithium Iron Phosphate (LiFePO4) Starting Battery

Description: 13.2 V, 15.6 Ah LiFePO4 starting battery with integrated Battery Management System (BMS) and thermal runaway containment, designed as a maintenance-free replacement for 12-volt lead-acid or lithium starter batteries in 14 CFR part 23 Aircraft.

Operating Conditions:

Supply voltage: 13.9–14.6 V (Standard Charge Voltage)
Operating temperature: -30 °C to +60 °C (short term +65 °C)
Max altitude: 25,000 Ft
Max charge current: 80 A (from aircraft charging system)

Absolute Maximum Ratings:

Max charge voltage: 16 V (from aircraft charging system)
Max continuous discharge current: 31 A
Max short term environmental temperature (on ground): 85 °C (30 minutes)
Max storage temperature: +70 °C

Key Specs:

Nominal Voltage: 13.2 V
Capacity (1C, 1hour rate at 23 °C): 15.6 Ah
Peak Power (Ipp, 23/-18 °C): 800 / 390 amps
Rated Power (Ipr, 23/-18 °C): 600 / 365 amps
Self-Discharge Rate: <3%/month @25°C
Life (Charge cycles): 4000 cycles @1C discharge rate, 25 °C (20% depth of discharge)
Weight: 5.4 lb
Dimensions: 166mm (L) x 79mm (W) x 168mm (H)

Features:

Integrated Battery Management System (BMS) with cell balancing and over-charge protection.
Over-discharge protection (disconnects below 5% charge, <11.5V).
Excessive cranking protection (limits high current use to 10-30 seconds in any 60-second period).
High temperature protection.
Short-circuit protection (>1000 Amps).
Redundant main electronic battery disconnect components.
Thermal runaway containment system with vent tubes.
Charge voltage protection greater than 60V (blocks charging current above 16V).
Built-in LED indicator and discrete output for fault monitoring (fast flashing for high temp, slow flashing for improper state of charge/cell problem, solid for BMS hardware failure).
IP 66 environmental rating (resistance to water intrusion).

Applications:

14 CFR part 23 Aircraft (as a maintenance-free replacement for 12-volt lead-acid or lithium starter batteries).

Package:

6.5in (L) x 3.1in (W) x 6.6in (H) (166mm x 79mm x 168mm)

Variants on the same datasheet

These parts have exact links to the same datasheet. They are candidates to compare, not verified drop-in replacements; check package, pinout and electrical limits.

Part Number	Manufacturer	Package
ETX900-24	EarthX, Inc.	—
ETX900-TSO	EarthX, Inc.	—
ETX900-TSO-REVX	EarthX, Inc.	—

More datasheets

All EarthX datasheets (4)

Data on this page is extracted from publicly available manufacturer datasheets using automated tools including AI. It may contain errors or omissions. Always verify specifications against the official manufacturer datasheet before making design or purchasing decisions. See our Terms of Service. Rights holders can submit a takedown request.

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