ETX900-TSO

TSO Battery

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

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

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

Manufacturer

EarthX, Inc.

ETX900-TSO Key Specifications

Parameter	Value
Chemistry	Lithium Iron Phosphate (LiFePO4)
BMS Part Number	BMS_DR
Nominal Voltage	12V (4 cells in series, 3.3V per cell, 13.2V)
Terminal Torque	45 in-lbs
Fault Discrete Output	Current-sinking, 100 mA max, 1/4" quick connect terminal
Maximum Charge Rating	80 A
Qualification Standards	TSO-C179b, DO-311A, DO-160G
Short Circuit Protection	>1000 A
Over-Discharge Disconnect	Below 5% remaining charge (typically below 11.5V)
BMS Design Assurance Level	DAL C (Major)
Over-Voltage Charge Blocking	Charging current blocked above 16V (resistance increases above 15.5V), 2 s delay
Equivalent Lead-Acid Capacity	16Ah lithium equivalent to 22Ah lead-acid
Excessive Cranking Protection	High current use limited to 10-30 seconds in any 60 second period
Maximum Charging System Voltage	16 V

ETX900-TSO 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	EarthX, Inc.	—
ETX900-24	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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