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E T X   T S O   L I T H I U M   B A T T E R I E S  
 

 

Installation 

The instruction given here is generic and is NOT the sole installation instruction for a 

particular aircraft.  For a specific aircraft, refer to the documentation listed in the Appendix 
of the Instructions for Continued Airworthiness (ICA) manual (180426). 

 

Remove all metal objects from your person before handling the battery and use insulated tools for 

installation. 

 

The power terminals of the ETX-900-TSO are ALWAYS live.  Do not short across the terminals. 

Use caution when handling the battery inside the aircraft around metallic structures. 

Battery Installation Location 

The  ETX900-TSO  is  designed  to  be  mounted  in  a  variety  of  locations  within  the  aircraft 

including the engine compartment, baggage compartment or cabin as long as the environmental 

condition  in  those  locations  do  not  exceed  the  battery’s  specifications  (see  the  specifications 
section and environmental qualification section of this manual).  The battery can be mounted in 

any position, such as upright or on its side. 

Battery Installation 

Lithium Iron Phosphate batteries are very robust, but if mishandled or misused they can 

rupture and they can burn.  Never disassemble the battery or disable the built-in Battery 

Management System (BMS).  It is recommended you check the voltage before installing.  If 

the voltage is below 13.2V, charge the battery before installing.  Follow these steps to 
properly and safely install your new ETX Lithium battery. 

 

1.

 

Remove the old battery, while paying attention to the routing and placement of 

wires, cables and protective covers. 
 

2.

 

Check the battery cables and connectors for corrosion or damage.  Pay special 

attention to the positive battery cable (red cable), checking for cuts or wear marks in 

the insulation.  Clean and or replace the battery cables as required. 

 

3.

 

Mount the battery in the existing battery box with the approved spacer (see 

Appendix for specific instructions). 

 

4.

 

Connect the positive (red) cable first.  Make sure the Phillips screw is securely 

fastened (45in-lbs), but do not over-tighten.  Next, connect the negative (black) cable 

and tighten screw to 45in-lbs.   Do not connect the battery in reverse polarity 

(positive to negative or negative to positive). 

 

Re-install the battery holder or strap and tighten securely.  Re-secure all the wires and cables 

with zip-ties or other fasteners.  . 

Summary of Contents for ETX900-TSO

Page 1: ...the property of EarthX Inc EarthX reserves the right to make changes to its documents or products without notice It is the responsibility of each user to ensure that all applications of EarthX s prod...

Page 2: ...E R I E S Revision Log Rev Description Date New Created New 4 07 2018 A Update to limitations DO 311A 8 30 2018 B Updated elect mech Installation sections Incorporate FAA AEG comments 11 24 2020 I C...

Page 3: ...Location 9 Battery Installation 9 Battery Vent Installation 10 Fault Monitoring Installation 10 Return to Service Checks Tests 13 Aircraft Voltage Monitoring Equipment if applicable 13 Accessory Parts...

Page 4: ...t today Lithium batteries are fundamentally different than lead acid batteries A lithium battery voltage remains relatively constant while discharging while voltage for a lead acid battery decreases A...

Page 5: ...al run away containment system The design aligns with the requirements for a FAA approved lithium battery as per RTCA performance specification DO 311A and DO 160 In the event of a charging system fai...

Page 6: ...d should not exceed a Peak Power Ipp 800 390 Amps 23C 18C Rated Power Ipr 600 365 Amps 23C 18C Note Old CCA spec is Ipr at 18C The capacity demand storage requirement should not exceed 31 Amps for 30...

Page 7: ...C 20 depth of discharge 2000 cycles 10C discharge rate 25 C 80 depth of discharge Life Years 6 Years Weight 5 4lb Dimensions 6 5in L x 3 1in W x 6 6in H 166mm L x79mm W x168mm H Environmental Rating r...

Page 8: ...E T X T S O L I T H I U M B A T T E R I E S 5...

Page 9: ...e current counting to track the charge level As seen from the graph the voltage only varies 4V for nearly 80 of the discharge cycle at 25 Deg C 13 4V is a good indication of full charge while 12 8V is...

Page 10: ...0 F an equivalent lead acid battery will outperform a lithium battery see the graph below Like lead acid batteries lithium batteries discharge performance is lower as the temperature decreases meaning...

Page 11: ...on temperature At high temperatures 25 C the cell internal resistance decreases so the self discharge rate increases See the graph below for self discharge rates in per month versus temperature 30 20...

Page 12: ...Iron Phosphate batteries are very robust but if mishandled or misused they can rupture and they can burn Never disassemble the battery or disable the built in Battery Management System BMS It is reco...

Page 13: ...ied tubing should be used The tubing is chemical resistant and rated for 500 F 1 4 ID 5 16 OD Teflon tubing The supplied stainless steel elbows allow the vent tubes to be routed to the left or right s...

Page 14: ...st other manufacturers male quick connect terminals The following two examples detail how to connect the fault monitoring output to an EFIS general purpose discrete input The EFIS DC source negative m...

Page 15: ...Monitoring Connection to 12V LED Part 11MM12 Connect the LED s red wire to a spare or existing fuse or breaker off the electrical bus Use any 25 Amp to 2 Amp fuse or breaker Connect the LED s white wi...

Page 16: ...not exist or are not adjustable The low charge level is very different from a lead acid battery for a lithium battery is completely drained at approximately 11 5V and the normal resting voltage is 13...

Page 17: ...ry low self discharge rate which means the battery if disconnected from the aircraft could hold its charge for over a year However some aircraft may have systems that use a small amount of power with...

Page 18: ...ltage reading then use a voltmeter to check the voltage while charging If the battery gets hot while charging discontinue charging and use Do not charge battery in temperatures above 140 degrees F 60C...

Page 19: ...out the online warranty submission form located on the EarthX website EarthX s acceptance of any items shipped to EarthX for warranty replacement shall not be deemed an admission that the item s are...

Page 20: ...aircraft s LED or EFIS If the fault LED on the battery is not extinguished the battery should be replaced Solid Light that turns off after 3 minutes Any voltage Short Circuit protection was activated...

Page 21: ...Federal Regulations or CFR s Title 49 CFR Sections 100 185 of the U S Hazardous Materials Regulations HMR Terminology The following table describes the terminology used in this document Ah Amp Hour i...

Page 22: ...Temperature 2 4 4 11 Passed functional performance per DO 311A Section 2 2 1 11 Short Circuit with Protection Enabled 2 4 4 12 Passed functional performance per DO 311A Section 2 2 1 12 Overdischarge...

Page 23: ...6 Equipment tested to Categories B Operational Shock and Crash Safety 7 Equipment tested to Categories B Vibration 8 Equipment tested to Category R S and U aircraft zone 1 and 2 for fixed wing turboje...

Page 24: ...Lightning Direct Effects 23 Equipment identified as Category X no test performed Icing 24 Equipment identified as Category X no test performed Electrostatic Discharge 25 Equipment tested to Categorie...

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