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EarthX ETX1200 User Manual

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EarthX Lithium
Battery User' s
Manual
Copyright© 2025 EarthX, Inc. All rights reserved. The information contained in this document is 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 products are as intended and safe based on conditions anticipated or encountered during
use. The EarthX logo is a trademark of EarthX, Inc

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  • Page 1 Copyright© 2025 EarthX, Inc. All rights reserved. The information contained in this document is 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 products are as intended and safe based on conditions anticipated or encountered during...

  • Page 2: Table Of Contents

    E T X - S E R I E S L I T H I U M B A T T E R I E S T able of Contents Overview .................... 1 Technology Inside ................1 Battery Cells ..................1 ETZ-Series - BMS ................

  • Page 3: Overview

    B A T T E R I E S Overview EarthX Lithium batteries are designed as a maintenance free replacement for the 12-volt lead-acid or lithium batteries. To ensure a smooth replacement process, our batteries are similar in dimensions to many OEM motorsport or power sport batteries. Our 12V replacement lithium battery consists of 4 Lithium Iron Phosphate (LiFePO4) cells in series and one or more in parallel with built in electronics to protect the lithium cells.

  • Page 4: Etz-Series - Bms

    ETZ-Series - BMS All EarthX integrated BMSs continuously monitor each cell’s voltage as part of the cell balancing and over-charge protection. If the voltage of a cell exceeds the others, the BMS circuits will work to reduce that cell’s charge level. This ensures that the charge level of all the cells remains equal, even with the high discharge (>...

  • Page 5: Etx-Hundred Series - Bms

    E T X - S E R I E S L I T H I U M B A T T E R I E S If the battery terminals are “shorted” (or a low impedance load is connected across terminals), which causes the battery volts to instantaneously drop to a very low level, the battery will disconnect from the load to protect the cells and BMS from damage (short circuit protection).
  • Page 6 < 100ms. The regulator over-voltage protection device shuts down the alternator by removing the field (pops the field breaker). If the alternator doesn’t shutdown, the EarthX BMS’s over-voltage protection will block incoming charge current after a 3 second delay above 16 volts.

  • Page 7: Operating Instruction

    E T X - S E R I E S L I T H I U M B A T T E R I E S single wire connection with a ¼” quick connect terminal. The output is a “current sinking” type circuit (see diagram below) that can handle 100mA (connects the discrete output to battery ground if a fault is present).
  • Page 8 E T X - S E R I E S L I T H I U M B A T T E R I E S LED Light Voltage Possible Cause Recommended Action Battery over-discharged Slow Flashing Less than Charge battery. Once charged, the (due to faulty charging (5s on/5s off) 12.8V...

  • Page 9: Limitations

    E T X - S E R I E S L I T H I U M B A T T E R I E S a fault. Continued use of a faulty battery can result in a cell rupture, the release of flammable vapors, smoke and or a fire.
  • Page 10 E T X - S E R I E S L I T H I U M B A T T E R I E S Environmental Rating (resistance to IP 66 (wash down with a high-pressure water intrusion) washer) Operating Temperature -30 °C to +60 °C Storage Temperature...
  • Page 11 E T X - S E R I E S L I T H I U M B A T T E R I E S Life (Charge cycles) 4000 cycles @ 1C discharge rate, 25°C (20% depth of discharge) 2000 cycles @10C discharge rate, 25°C (80% depth of discharge) Life (Years)
  • Page 12 E T X - S E R I E S L I T H I U M B A T T E R I E S Storage Temperature -40 °C to +70 °C Model: ETX24C Voltage 13.2 V Ah (Lead-acid equivalent) Ah (1 hour discharge rate) 7.8 (1C rate) Pulse Crank Amps (PCA)
  • Page 13 E T X - S E R I E S L I T H I U M B A T T E R I E S Life (Charge cycles) 4000 cycles @ 1C discharge rate, 25°C (20% depth of discharge) 2000 cycles @10C discharge rate, 25°C (80% depth of discharge) Life (Years)
  • Page 14 E T X - S E R I E S L I T H I U M B A T T E R I E S Model: ETX104 (back up power only battery, not a starter battery) Voltage 13.2 V...
  • Page 15 E T X - S E R I E S L I T H I U M B A T T E R I E S Life (Charge cycles) 4000 cycles @ 1C discharge rate, 25°C (20% depth of discharge) 2000 cycles @10C discharge rate, 25°C (80% depth of discharge) Life (Years)
  • Page 16 E T X - S E R I E S L I T H I U M B A T T E R I E S 6.2A (.5C) 12.4A (1C) 18.6A (1.5C) Time (Minutes) ETX680/680C Discharge Time Model: ETX900 / ETX900-VNT Voltage 13.2 V Capacity...
  • Page 17 E T X - S E R I E S L I T H I U M B A T T E R I E S Weight (ETX900) / (ETX900-VNT) 4.9 lb. (2.2Kg) / (VNT model is 5.4lb) Dimensions 6.5in (L) x 3in (W) x 6.6in (H) 166mm(L)x76mm(W)x168mm(H) Environmental Rating (resistance to IP 66 (wash down with a high-pressure...
  • Page 18 E T X - S E R I E S L I T H I U M B A T T E R I E S 6.2A (.39C) 12.4A (.77C) 18.6A (1.16C) 90 100 110 120 130 140 150 160 Time (Minutes) ETX900 Discharge Time Model: ETX1200 (January 2023 or older models)
  • Page 19 E T X - S E R I E S L I T H I U M B A T T E R I E S Storage Temperature -40 °C to +70 °C Maximum Altitude 50,000 Ft Model: ETX1200 ( Effective February 2023 ) Voltage 13.2 V Nominal Voltage...
  • Page 20 E T X - S E R I E S L I T H I U M B A T T E R I E S ETX1200 Discharge Capacity ETX1200 Discharge Time Model: ETX1600 Voltage 13.2 V Nominal Voltage 12.8 V Capacity 32Ah @ 1C rate Capacity vs Temperature...
  • Page 21 E T X - S E R I E S L I T H I U M B A T T E R I E S 0°C = 97% -30°C = 95% Self-Discharge Rate <2%/month @ 25°C Pulse Crank Amps (PCA) 1600A (3 sec @ 20 °C, voltage >7.2V) Cold Crank Amps (CCA) 760A (modified SAE test, 3 sec@ 0°F,...
  • Page 22 E T X - S E R I E S L I T H I U M B A T T E R I E S (@28V from charging system) Life (Charge cycles, 80% depth of 4000 cycles @ 1C discharge) discharge rate, 25°C 2000 cycles @10C...
  • Page 23 E T X - S E R I E S L I T H I U M B A T T E R I E S ETX900-24 Discharge Capacity Model: ETX680-24-VNT Voltage 26.4 V Capacity 11.7Ah (See charts) Capacity vs Temperature 25 °C = 100% 0°C = 97% -30°C = 95%...
  • Page 24 E T X - S E R I E S L I T H I U M B A T T E R I E S Dimensions 6.5 in (L) x 5.1 in (W) x 6.6 in (H) 166mm(L) x 129mm (W) x 168mm (H) Environmental Rating (resistance to IP 66 (wash down with a high-pressure water intrusion)
  • Page 25 E T X - S E R I E S L I T H I U M B A T T E R I E S ETX680-24-VNT Discharge Capacity Model: ETX1200-24-VNT Voltage 26.4 V Capacity (1C, 1hour rate at 23 °C) 19.4Ah @ 1C rate (See below) Capacity vs Temperature 25 °C = 100%...
  • Page 26 E T X - S E R I E S L I T H I U M B A T T E R I E S Short Term Ground Survival Temp 85 °C (30 minutes) Maximum Altitude 50,000 Ft Shelf Life 1 year (without charging) ETX1200-24-VNT Discharge Capacity Model: ETX400-24-VNT...

  • Page 27: Discharge Versus Temperature

    E T X - S E R I E S L I T H I U M B A T T E R I E S Operating Temperature (short term) -30 °C to +60 °C (+65 °C for 30minutes); If equipped with heater, -40 °C to +60 °C Storage Temp -40 °C to +70 °C...

  • Page 28: Self-Discharge Rates

    E T X - S E R I E S L I T H I U M B A T T E R I E S Cranking Amps vs Temp Lithium Lead Acid Temp Deg C Self-discharge Rates The self-discharge rate is dependent on temperature. At high temperatures (>25°C), the cell internal resistance decreases so the self-discharge rate increases.

  • Page 29: Discharge Curves

    E T X - S E R I E S L I T H I U M B A T T E R I E S Self Discharge Rate vs Temp Discharge Rate (%/Month) Discharge Curves Voltage is not a good indication of the state-of-charge in lithium batteries. The first graph below shows the state-of-charge versus voltage at a 1C discharge rate for the ETX12 (representative of the ETX-Series batteries).
  • Page 30 ETX12 discharge curves at a 1C rate over a wide operating temperature range. Note: there can be as much as a 15% decrease in Ah and discharge voltage at -30deg C as compared to 25 deg C. All the EarthX ETX-Series batteries exhibit similar discharge curve profiles.

  • Page 31: Installation

    E T X - S E R I E S L I T H I U M B A T T E R I E S Installation Battery Installation Lithium Iron Phosphate batteries are very robust, but if mishandled or misused they can rupture and they can burn.

  • Page 32: Fault Monitoring Installation (Etx-Hundred Series)

    E T X - S E R I E S L I T H I U M B A T T E R I E S 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.
  • Page 33 E T X - S E R I E S L I T H I U M B A T T E R I E S how to connect the fault monitoring output to an EFIS general purpose discrete input. The EFIS DC source negative must be referenced to the battery negative (this is the standard configuration).
  • Page 34 E T X - S E R I E S L I T H I U M B A T T E R I E S Configure the input as “active low”, “alarm” type. Within SENSOR INPUT MAPPING, configure the desired pin as a CONTACT input ALARM.
  • Page 35 E T X - S E R I E S L I T H I U M B A T T E R I E S Configure the digital input 1-4 (pin 40-43) as “active low”, “user defined alert” type. Fault Monitoring Connection to Grand Rapids Technologies EFIS...
  • Page 36 E T X - S E R I E S L I T H I U M B A T T E R I E S The following example details how to connect the fault monitoring output to a remote LED. An incandescent bulb can NOT be used.

  • Page 37: Voltage Monitoring Alert Recommendation (Existing Aircraft Equipment If Applicable)

    E T X - S E R I E S L I T H I U M B A T T E R I E S RS-232 Communications Connection (ETX1200-24-VNT only) The ETX400-24-VNT, ETX680-24-VNT and ETX1200-24-VNT have a 3-Pin connector to provide the discrete fault output.

  • Page 38: Vent Tubing Installation (Models With Part # That End In Vnt)

    ID of 3/8”. Fittings must be brass or stainless if installed within 2 feet from the battery (EarthX supplied kit parts ok). For fittings more than 2 feet from the battery they may be polyethylene or nylon. See figure below for tubing connections to the battery and...
  • Page 39 B A T T E R I E S Installation of the battery in the cockpit is not recommended unless the battery is properly vented over-board, or unless all EarthX and aircraft safety (alternator over-voltage protection) precautions are followed (limitations, installation, operation, and inspections detailed in this manual).
  • Page 40 E T X - S E R I E S L I T H I U M B A T T E R I E S Images below for ETX680-24-VNT Mounting and Vent Tubes...
  • Page 41 E T X - S E R I E S L I T H I U M B A T T E R I E S Images below for ETX1200-24-VNT Mounting and Vent Tubes...

  • Page 42: Back View

    E T X - S E R I E S L I T H I U M B A T T E R I E S Back View Top View Battery Inspection and Testing The ETX-Hundred Series battery is a maintenance free battery. Charging is only required as needed (see charging section in this manual).

  • Page 43: Charging

    E T X - S E R I E S L I T H I U M B A T T E R I E S • Ensure the terminal screws are tight (properly torqued) For electrically dependent aircraft the following annual battery capacity testis recommended: To test the battery capacity (should be done at near room temperature, 23DegC): a.
  • Page 44 25 amps. After installing the ETX680, the peak charge amps jumped to 54 amps. This is normal and as expected and within the charge current rating of the ETX680. This table shows typical charging times for the different EarthX batteries: Model Charging Amps...
  • Page 45 15V! This will damage the battery. If in doubt, consult the manual that comes with your charger. The “full charge” voltage for the EarthX Lithium battery is 13.9V or higher. Some lead-acid battery trickle charger’s maintenance mode voltage can be below 13.3V, which is too low for a lithium battery.
  • Page 46 (set at 13 volt) or another 12V battery in parallel with the EarthX battery so the charger will read the connected device’s voltage. Once the charger sees a normal battery voltage (volts above 9 volts) it should engage and start charging.

  • Page 47: Storage

    EarthX, Inc. (Manufacturer) warrants its ETX-Series lithium batteries (hereafter referred to as Battery or Batteries) and the EarthX Jump Pack to be free of defects in material and workmanship for a period of two years. EarthX, Inc. warrants the ETZ-Series lithium batteries to be free of defects in material and workmanship for a period of 1 year.

  • Page 48: Regulations

    E T X - S E R I E S L I T H I U M B A T T E R I E S Regulations The ETX-Series Lithium battery, including the ETX-Hundred Series, are designed and tested to the following safety regulations as outlined in: •...

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