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Home Page | Experimental Aircraft

Experimental Aircraft

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EarthX ETX Hundred Series batteries are the most used and trusted batteries on the market! EarthX is an American engineering company that is the first in the world to achieve a 13.2V FAA approved TSO Certified lithium starter battery! The ETX Hundred series are designed specifically for your aircraft starter or backup battery needs. The latest model added is the ETX104, designed for your back up power for your critical systems complete with current limiting so it works with any aircraft charging system. If you know which battery you require for your aircraft, feel free to scroll to the bottom of the page to view our products. If you aren’t sure which battery is right for your application, check out our helpful flowchart or use the search option on this page.

Here is a link to the 2020 EAA Oshkosh webinar: https://www.eaatogether.org/live/forums/6173986854001

All the aircraft you see on this site are real users of the EarthX battery!

Bandit Flight Team – Flying for the Flag. EarthX is proud to support this team who’s is composed of veterans whose mission is to honor those who serve with flyovers timed to the National AnthemBandit Flight Team – Flying for the Flag. EarthX is proud to support this team who’s is composed of veterans whose mission is to honor those who serve with flyovers timed to the National Anthem
Bandit Flight Team – Flying for the Flag. EarthX is proud to support this team who’s is composed of veterans whose mission is to honor those who serve with flyovers timed to the National AnthemBandit Flight Team – Flying for the Flag. EarthX is proud to support this team who’s is composed of veterans whose mission is to honor those who serve with flyovers timed to the National Anthem
EarthX customer flying over IcelandEarthX customer flying over Iceland
Lightning Formation AirshowsLightning Formation Airshows
Thom Pomeroy PlaneThom Pomeroy Plane
REMOS GX series aircraftREMOS GX series aircraft
Tim Simko Rans S-7STim Simko Rans S-7S
Glasair III with the ETX900. Pilot: Alan NegrinGlasair III with the ETX900. Pilot: Alan Negrin
EarthX batteries have allowed our team to implement a solution for the Jack Links Screamin Sasquatch Jet Waco that simply could not be completed with the standard aircraft batteries on the market today. Combine that with a responsive and knowledgeable team of technicians and you have a winning combination for success! – John Klatt AirshowsEarthX batteries have allowed our team to implement a solution for the Jack Links Screamin Sasquatch Jet Waco that simply could not be completed with the standard aircraft batteries on the market today. Combine that with a responsive and knowledgeable team of technicians and you have a winning combination for success! – John Klatt Airshows
Viking Engine uses EarthX batteries as you are saving weight where it counts! – Jan Eggenfellner-Owner/CEO Viking EnginesViking Engine uses EarthX batteries as you are saving weight where it counts! – Jan Eggenfellner-Owner/CEO Viking Engines
EarthX’s ETX680Cs are a perfect match for an air racer!  We saved 26 lbs and gained safe and reliable batteries.EarthX’s ETX680Cs are a perfect match for an air racer! We saved 26 lbs and gained safe and reliable batteries.
I replaced the Odyssey PC680 (14#) with an EarthX ET900 (4.9#) in my MX2 with Lycon IO540 with 11:1 compression ratio. I now have well over 50 starts on it and it spins the engine over much, much better than the PC680. On a cold engine the 680 would never go past the first compression stroke without having to back off and hitting the starter again. The EarthX has never failed to spin it up on the first try. Even while I was in 45* temps at Valdez, AK last month. Losing 9# and getting much better starts is a Win Win situation!I replaced the Odyssey PC680 (14#) with an EarthX ET900 (4.9#) in my MX2 with Lycon IO540 with 11:1 compression ratio. I now have well over 50 starts on it and it spins the engine over much, much better than the PC680. On a cold engine the 680 would never go past the first compression stroke without having to back off and hitting the starter again. The EarthX has never failed to spin it up on the first try. Even while I was in 45* temps at Valdez, AK last month. Losing 9# and getting much better starts is a Win Win situation!
Stephen Covington, of SRC Airshows – I absolutely love the Earth X batteries. For my Aerobatic plane, it is such a nice thing to have a battery that is so light and yet has 2X’s the cranking power of a normal battery! Cold, hot, long term sitting, it doesn’t matter the battery is always there for me and starts right up!Stephen Covington, of SRC Airshows – I absolutely love the Earth X batteries. For my Aerobatic plane, it is such a nice thing to have a battery that is so light and yet has 2X’s the cranking power of a normal battery! Cold, hot, long term sitting, it doesn’t matter the battery is always there for me and starts right up!
Larry Mednick, chief designer and owner of Evolution Aircraft: We only use the best of the best components in the REVO. EarthX has the performance, quality and reliability we demand. With unmatched features required for our aircraft the choice was simple.Larry Mednick, chief designer and owner of Evolution Aircraft: We only use the best of the best components in the REVO. EarthX has the performance, quality and reliability we demand. With unmatched features required for our aircraft the choice was simple.
Sonex Aircraft loves the EarthX battery because of the tremendous weight savings vs. traditional cells. EarthX has the cranking power and cell management safety we need vs. other lithium starter batteries we have tried.Sonex Aircraft loves the EarthX battery because of the tremendous weight savings vs. traditional cells. EarthX has the cranking power and cell management safety we need vs. other lithium starter batteries we have tried.
Michael Steiger- NART (Noel Art Racing Team)Michael Steiger- NART (Noel Art Racing Team)
Spencer Suderman who just attained the Guinness Book of World Records for 98 inverted flat spins powered with an EarthX battery! Twice the starting power at 20% the weight…That’s why I LOVE the EarthX battery!Spencer Suderman who just attained the Guinness Book of World Records for 98 inverted flat spins powered with an EarthX battery! Twice the starting power at 20% the weight…That’s why I LOVE the EarthX battery!
Mark Steward Steen – SkyboltMark Steward Steen – Skybolt
Kitfox Aircraft chooses EarthX batteries as they are very light weight and reliable with a built-in battery management system for safety. The EarthX is also build in the USA and is backed with outstanding customer service and support. John McBean-Owner/CEO Kitfox AircraftKitfox Aircraft chooses EarthX batteries as they are very light weight and reliable with a built-in battery management system for safety. The EarthX is also build in the USA and is backed with outstanding customer service and support. John McBean-Owner/CEO Kitfox Aircraft
Kitfox-S7 Super SportKitfox-S7 Super Sport

Our lithium airplane batteries are proudly used by many aircraft and helicopter manufacturers, including Vans Aircraft. They are tested and used by many engine companies, such as Rotax, Continental, Lycoming, and UL Power.

Why Choose LithiumEarthX/OdysseyBattery ManagementImportant Safety/Use Precautions

Why Choose an EarthX Lithium Battery for Your Experimental Aircraft?

  1. You’ll instantly remove 11+ pounds compared to the lead acid battery in your experimental aircraft! Now that’s a huge weight savings.
  2. Significant increase in cranking power. If you’ve been using the PC680, you’ll increase your CCA’s from 170 to 320 and the PCA’s from 520 to 680! Now that’s power to crank your engine!
  3. You can easily have a backup battery and not worry about the additional weight. In fact, if you switch from a lead acid battery and add a backup battery, so you have a primary and a backup, you’ve still decreased your overall weight by 50%!
  4. Innovative and sophisticated BMS designed and engineered with redundancy for safety, reliability, and performance. These are EXCLUSIVE features!

3 Things to Consider When Choosing the Right Battery for Your Plane:

1. Can it turn the engine over (CCA)?
2. Does it have enough capacity to run your needed instruments if the alternator/generator fails (true amp hours)?
3. Is it designed for the application you are using it in (alternator/generator max amperage output)?

As Odyssey batteries are widely used in the experimental market so we have a chart of the Odyssey’s batteries and the EarthX batteries to assist you in a comparison.

Model Price Volts Ah
(1 hr 1C rate)
Crank Amps
(PCA/CCA)
Weight Case Size
(L x W x H)
Aircraft Guidelines
ETX680C* $379 13.2 12.4 680/320 3.9 lb (1.8Kg) 5.9” x 3.4” x 4.5”

150mm x 86mm x 115mm

400ci engine size or less;

60 amp alternator/generator or less

ETX680* $379 13.2 12.4 680/320 4.1 lb (1.86Kg) 6.5” x 3.1” x 6.6”

166mm x 79mm x 168mm

400ci engine size or less;

60 amp alternator/generator or less

ETX900/ETX900-VNT* $449/$549 13.2 16 840/400 4.9/5.4 lb (2.2/2.4Kg) 6.5” x 3.1” x 6.6”

166mm x 79mm x 168mm

540ci engine size or less;

80 amp alternator/generator or less

ETX1200* $725 13.2 24.8 1200/600 6.9 lb. (3.1Kg) 6.5” x 3.1” x 6.6”

166mm x 79mm x 168mm

550ci engine size or larger;

120 amp alternator/generator or less

* ETX680C, 680, 900, 900-VNT, ETX900-24, ETX900-TSO and ETX1200 has redundant electronics and battery cell / hardware fault monitoring. The ETX900-VNT, ETX900-TSO also has built in thermal runaway containment and venting for in cabin installation. Operating temperature – 30°C to 60°C or -22°F to 140°F

For Comparison Purposes Only…

Voltage Weight Ah (1 hour 1C rate) Case Size inches
(L x W x H)
Cranking Amp
(PCA/CCA)
Overcharge Protection? Overdischarge Protection? Max Alternator Charging Amp’s
Odyssey PC1200* 12 38.2lb (17.3kg) 32.1 7.87 x 6.66 x 7.60 1200/540 No No not specified
Odyssey PC 925* 12 26lb (11.8kg) 24.3 6.64 x 7.05 x 5.83 900/300 No No not specified
Odyssey PC680* 12 15.4lb (7kg) 12.3 7.27 x 3.11 x 6.65 520/170 No No not specified
Odyssey PC625* 12 13.2lb (6.2kg) 13.6 6.7 x 3.9 x 6.95 530/200 No No not specified
Odyssey PC545* 12 11.2lb (5kg) 9.6 7 x 3.38 5.17 460/150 No No not specified
*information used from www.odysseybattery.com
**without metal jacket for the Odyssey Operating temperature -40 C to 45 C or -40°F to 113°F

Battery Management Features:

1-  Over discharge protection. If you leave your master key on, the battery will disconnect internally prior to cell damage (approximately when about 95% of the energy has been drained). You’ll need to charge the battery before use again in this scenario.

2- Over charge protection. If you have a voltage reading above 15.2V, your regulator has failed and your overvoltage protection in the plane will be activated if you have this safety feature. If your over voltage protection in the plane fails, the batteries over voltage protection will engage. In this scenario, the battery does not  disconnect but instead blocks the excess current/voltage into the battery. If you see high voltage and amperage readings, you should immediately take your alternator off line to avoid damage to your electronics and possibly damage to the battery. The BMS protection has limitations and is designed to protect your battery, not your electronics. See manual for details of this feature.

3- Short circuit protection up to 1000 amps.

4- Excessive cranking protection. If you’re trying to start your engine continuously for a long period of time, the cells inside the battery will heat. The BMS will disconnect for approximately 90 seconds so the cells can cool off and not cause damage to the battery.

5- Built-in cell balancing technology.

6- LED battery fault light indicator. This alerts the user to the state of charge and the health of the battery. The LED light will illuminate to let you know when there is a something outside of the normal range. This is a very important safety feature; be sure to connect it to your EFIS or LED light on your control panel.

Please review the manual for details about these features and for a check list of possible LED light causes and steps to be taken.

Important safety/use precautions:

1-The ETX Hundred series have a different BMS with built in redundancy and additional safety features than our power sport line. Do not use the power sport models for your aircraft.

2- If you have an alternator or generator that outputs greater than 20 amps, over voltage protection is required. (crowbar protection) 

3- Do not use any lithium battery in a vintage engine that was not originally designed for a battery, such as a Rotax 503 pull start. (Provision 4, gear box with 4 bolts).

4- Only the ETX900-VNT is designed for in cabin installations as it has a venting system build in and is also in a fire proof containment system.

You will gain a significant amount of cranking amps and drop a minimum of 11+ pounds instantly by switching from a lead acid battery to the EarthX lithium battery.

  • 24V Optimate TM-281 (LifePo4) Battery Charger/Maintainer/Power Supply

    $168.89

    FREE SHIPPING IN THE USA!

    The Optimate TM-281 24V Lithium battery charger will charge and maintain your lithium battery with 5 amps of energy so your battery is ready to go when you are! This lithium charger also has a “tune” or  power source mode of delivering 4 continuous amps of energy so you can program your EFIS or retune your car plus a pushbutton activated BMS “wake up” mode to safely wake up a battery out of sleep mode.

    • Lithium Battery Charger
    • Lithium Battery Maintainer
    • Power Supply
    Add to cart
  • 5mm12 12V LED Fault Light Panel Mount Indicator

    $29.99

    FREE SHIPPING IN THE USA!

    Easily see if you have a battery fault with this 5mm Amber LED light for your EarthX experimental aircraft or race car batteries.

    The 12V LED has a built in resistor for easy installation and compatibility with a 10-15V electrical system.  Details installation directions are located in the EarthX manual but it is very simple. To install, connect red wire to a positive bus connection, connect the black wire to fault monitoring wire (also black) that is located on the EarthX battery.

    Specifications:

    Color: Red

    Mounting: Nut and Washer (included)

    Termination style: Wire  20ga- 48″ length

    Voltage: 12V

    Built in resistor: 500 ohm, 1/2 Watt

    Drill bit size: .325 or 5/16″

    Add to cart
  • 5mm24 24V LED Fault Light Panel Mount Indicator

    $29.99

    FREE SHIPPING IN THE USA!

    Easily see if you have a battery fault with this 5mm 24V Amber LED light for your EarthX experimental aircraft or race car batteries.

    The 24V LED has a built in resistor for easy installation and compatibility with a 26.2-29.2V electrical system.  Details installation directions are located in the EarthX manual but it is very simple. To install, connect red wire to a positive bus connection, connect the black wire to fault monitoring wire (also black) that is located on the EarthX battery.

    Specifications:

    Color: Amber

    Mounting: Nut and Washer (included)

    Termination style: Wire  20ga- 48″ length

    Voltage: 24V

    Built in resistor: 500 ohm, 1/2 Watt

    Drill bit size: .325 or 5/16″

    Add to cart
  • Additional Vent Tubing for the ETX900-VNT

    $2.25

    Need additional tubing for the ETX900-VNT?  Enter the quantity you want in feet.  (1/4″ inside diameter, 5/16″ outside diameter)

    Note: This would be additional to the 6 feet that comes standard with the ETX900-VNT.

    Add to cart
  • Amber LED Indicator

    $89.00

    FREE SHIPPING IN THE USA!

    Press to Test indicator features a dimming actuator, LED replaceable lamp, and an amber lens.

    Military grade panel mount indicator meets or exceeds military specification MIL-L-3661B with high quality black anodized aluminum housing.

    The 12V LED is easy to installation and compatible with a 10-15V electrical system. If you do not have an EFIS to connect to, this is a required indicator light if installing in a certified aircraft along with the ETX900-TSO battery.  Details installation directions are located in the EarthX manual but it is very simple. To install, connect red wire to a positive bus connection, connect the black wire to fault monitoring wire (also black) that is located on the EarthX battery.

    Specifications:

    • Color: Amber
    • Voltage: 12V
    • Drill bit size: 15/32″

    Kit includes:

    • Wire  20ga- 60″ in length
    • Mounting: Nut and Washer (included)
    • Replaceable LED lamp
    Add to cart
  • BB-CO Light Weight Battery Box for “C” case

    $49.00

    FREE SHIPPING IN THE USA!

    This is a custom designed aluminum battery box designed specifically for the EarthX lithium battery ETX680C or any of the “C” cased batteries. This battery box was engineered to be strong enough to withstand 30 G of force yet only weighs 4.9 ounces or 140 grams and will fit your battery like a glove. This unique design allows for simple, easy installation with the dimensions: 5.9″ L x 3.4″ W x 4.5″H.  Model number BB-CO

    Click here for Battery Box Installation Guide
    Add to cart
  • BB-CU Custom Light Weight Battery Box for “E” Case

    $49.00

    FREE SHIPPING IN THE USA!

    This custom designed battery box will fit your battery like a glove and is super easy to install!

    Custom designed aluminum battery box for the ETX680/ETX900/ETX900-VNT and the ETX1200 series of EarthX batteries.  This battery box was engineered to be strong enough to withstand 30 G of force yet only weighs 7 ounces or 198 grams and will fit the ETX680, ETX900/ETX900-VNT or ETX1200 like a glove. This unique design allows for simple, easy installation with the dimensions: 6.5″ L x 3.1″ W x 6.6″H. Note: if you purchased an ETX1200 prior to 12-1-2016, this battery box will not fit. Model number BB-CU.

    Click here for Battery Box Installation Guide
    Add to cart
  • BB-MU2- Light weight aluminum battery box

    $89.00

    FREE SHIPPING IN THE USA!

    The  light weight aluminum battery box is excellent to use with the EarthX lithium “E” case batteries for easy installation!

    Super easy installation and use of this newly revised and improved battery box! It has a bolt-down tab for easy removal of the battery from the front or top, and is acrobat rated (even with PC680 ).

    This battery box can be used with:

    • ETX680
    • ETX900
    • ETX900-VNT
    • ETX1200
    • Odyssey’s PC 680

    If you are using the battery box for the EarthX Lithium batteries, you will use a foam spacer on the left and right side of the battery for a snug fit. If you are using the battery box for the PC680, you will use the foam spacer on the backside at the bottom of the case to adjust for the tapering of the case for a snug fit. That easy!

    This battery box was engineered to be strong enough to withstand 30 G of force for the EarthX Lithium Batteries or  6G of upward force and 9G of downward force with the PC680.  It only weighs 8.6 ounces or 244 grams. This unique design allows for simple, easy installation with the dimensions: 7.1″ L x 3.1″ W x 6.5-6.6″ (adjustable height) or (180mm x 80mm 166-168mm).

    Click here for Battery Box Installation Guide

    Included:  top front removeable hold down tab,  2 screws for the hold down, and the battery box

    Add to cart
  • BB-MU: Light Weight Battery box fit “E” case and PC680

    $59.00

    FREE SHIPPING IN THE USA!

    The light weight aluminum battery box is excellent to use with the EarthX lithium batteries for easy installation!

     

    This battery box can be used interchangeably for the EarthX Lithium Battery models ETX680/900/900-vnt/1200 or the Odyssey PC680 with the use of a foam spacers. We call it the multi-use battery box for this reason.

    $59.00

    If you are using the battery box for the EarthX Lithium batteries, you will use a foam spacer on the left and right side of the battery for a snug fit. If you are using the battery box for the PC680, you will use the foam spacer on the backside at the bottom of the case to adjust for the tapering of the case for a snug fit. That easy!

    This battery box was engineered to be strong enough to withstand 30 G of force for the EarthX Lithium Batteries or 15 G of force for the PC680 yet only weighs 8.6 ounces or 244 grams. This unique design allows for simple, easy installation with the dimensions: 7.1″ L x 3.1″ W x 6.5-6.6″ (adjustable)H or (180mm x 80mm 166-168mm).

    As there are so many battery box options on the market, and different hole patterns possible,  we do not know if the hole pattern will match up to your current situation so you might need to drill new holes on the flanges.  Model number BB-MU.

    Included:  top front hold down,  2 screws for the hold down, and the battery box

    Click here for Battery Box Installation Guide

    Add to cart
  • BB-TH Thermal Battery Box “E” case

    $115.00

    FREE SHIPPING IN THE USA!

    Thermal battery box to protect from radiated or convection heat!

    The EarthX thermal battery box is designed to protect the battery in engine compartment installations from periods of high temperature (up to 1 hour), such as after shutdown, and from radiant heat from hot surfaces like exhaust systems during and after flight. This stainless-steel box has a mirror finish to minimize the effect of radiant heat, and it has a high-performance insulating foam layer between the box and battery to reduce effect of convection heat. The hold-down tab comes with a mounting fixture that can hold a cooling air duct up to 1” in diameter. This battery box was engineered to be strong enough to withstand 30 G of force yet only weighs 1 pound.

    All batteries have optimal temperature ranges for use in operation. The ETX hundred series is rated for 140 deg F ( 60 deg C) or less for optimal longevity and performance of the battery. Typical lead acid batteries are rated to 113 deg F or 45 deg C.

    This battery box is designed to be compatible with our existing “E” case battery models; ETX680/900/1200.

    Click here for Battery Box Installation Guide

    Model BB-TB

    The “Radiant and Convection” graph shows the internal cell temperature with an extreme test example.  The battery was placed in a test environment chamber with temperatures of 185 Deg F (85 deg C) and simulated 1000 Deg F (538 deg C) exhaust pipe 6 inches from the front of the battery.  In this case there was a 3.5X improvement in the time to heat up the battery cells to the high operating limit.  In less extreme temperatures, the improvement can be 4X.

    The “Convection” graph shows the battery (not cell) temperature rise with a test environment of 185 Deg F (85 deg C).   In this case there was a 5.3X improvement in the time to heat up the battery.

    Add to cart
  • BB-TH-CO Thermal Battery Box “C” case

    $115.00

    FREE SHIPPING IN THE USA!

    Thermal battery box to protect from radiated or convection heat!

    The EarthX thermal battery box is designed to protect the battery in engine compartment installations from periods of high temperature (up to 1 hour), such as after shutdown, and from radiant heat from hot surfaces like exhaust systems during and after flight. This stainless-steel box has a mirror finish to minimize the effect of radiant heat, and it has a high-performance insulating foam layer between the box and battery to reduce effect of convection heat.  This battery box was engineered to be strong enough to withstand 30 G of force yet only weighs 1 pound.

    All batteries have optimal temperature ranges for use in operation. The ETX hundred series is rated for 140 deg F ( 60 deg C) or less for optimal longevity and performance of the battery. Typical lead acid batteries are rated to 113 deg F or 45 deg C.

    This battery box is designed to be compatible with our existing “C” case battery models; ETX680C.

    Click here for Battery Box Installation Guide

    Model BB-TBC

    The “Radiant and Convection” graph shows the internal cell temperature with an extreme test example.  The battery was placed in a test environment chamber with temperatures of 185 Deg F (85 deg C) and simulated 1000 Deg F (538 deg C) exhaust pipe 6 inches from the front of the battery.  In this case there was a 3.5X improvement in the time to heat up the battery cells to the high operating limit.  In less extreme temperatures, the improvement can be 4X.

    The “Convection” graph shows the battery (not cell) temperature rise with a test environment of 185 Deg F (85 deg C).   In this case there was a 5.3X improvement in the time to heat up the battery.

    Add to cart
  • BB-TH-U Thermal Battery Box “U” case

    $125.00

    FREE SHIPPING IN THE USA!

    Thermal battery box to protect from radiated or convection heat!

    The EarthX thermal battery box is designed to protect the battery in engine compartment installations from periods of high temperature (up to 1 hour), such as after shutdown, and from radiant heat from hot surfaces like exhaust systems during and after flight. This stainless-steel box has a mirror finish to minimize the effect of radiant heat, and it has a high-performance insulating foam layer between the box and battery to reduce effect of convection heat.

    All batteries have optimal temperature ranges for use in operation. The ETX hundred series is rated for 140 deg F ( 60 deg C) or less for optimal longevity and performance of the battery. Typical lead acid batteries are rated to 113 deg F or 45 deg C.

    This battery box is designed to be compatible with our existing “U” case battery models; ETX1600, ETX900-24, ETX680-24-VNT.

    Click here for Battery Box Installation Guide

    Model BB-TH-U

    The “Radiant and Convection” graph shows the internal cell temperature with an extreme test example.  The battery was placed in a test environment chamber with temperatures of 185 Deg F (85 deg C) and simulated 1000 Deg F (538 deg C) exhaust pipe 6 inches from the front of the battery.  In this case there was a 3.5X improvement in the time to heat up the battery cells to the high operating limit.  In less extreme temperatures, the improvement can be 4X.

    The “Convection” graph shows the battery (not cell) temperature rise with a test environment of 185 Deg F (85 deg C).   In this case there was a 5.3X improvement in the time to heat up the battery.

    Add to cart
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