Product Specifications for EarthX ETX680-24-VNT 24-28V Lithium Battery for Experimental Aircraft
| BM Part #: | ETX680-24-VNT |
|---|---|
| Brand: | EarthX |
| Voltage: | 26.4 Volt |
| Capacity: | 11.7 Ah |
| Energy Capacity: | 299 Wh |
| Type: | LiFePO4 |
| Length: | 6.5" |
| Width: | 5.1" |
| Height: | 6.6" |
| Shipping Weight: | 7.20Lbs |
| Warranty: | 2 Year |
| Product Manual: | Download |
| Datasheet: | Download |
What's in the box:
- 1 x ETX680-24-VNT
- 2 x 8mm screws with washer and lock washer
- This item is not eligible for free shipping.
- 850 Peak Cranking Amps: Delivers strong, reliable starts for piston engines up to 550ci.
- Lightweight at 7.2 lbs: Frees up useful load without sacrificing cranking power or capacity.
- Built-in Battery Management System (BMS): Protects cells from overcharge, over-discharge, short circuits, and temperature extremes.
- EFIS-Compatible Fault Indicator: Connects to your panel or EFIS to display real-time battery health alerts.
- 6+ Month Shelf Life: Holds a full charge for over six months when completely disconnected from the aircraft.
- Corrosion-Free Chemistry: Lithium iron phosphate cells won't sulfate or corrode, even after extended storage.
Product Description
A Smarter Battery for Serious Experimental Builders
Building or upgrading an experimental aircraft means every pound matters. Lead-acid batteries are heavy, they sulfate over time, and they give you no real warning before they fail. The EarthX ETX680-24-VNT was designed to fix all three of those problems at once.
At just 7.2 lbs, it delivers serious weight savings compared to a conventional lead-acid battery of comparable cranking ability — weight you can put back into useful load, fuel, or avionics.
850 Peak Cranking Amps in a Compact Package
The ETX680-24-VNT puts out 850 PCA and 400 CCA at 26.4 volts nominal. That higher starting voltage means a stronger, faster crank compared to a depleted lead-acid — exactly when you need it most. It handles piston engines up to 550ci and fits a standard "U" case footprint at 6.5" L × 5.1" W × 6.6" H.
You'll Know What Your Battery Is Doing
One of the most common frustrations with aircraft batteries is not knowing their state of health until it's too late. The ETX680-24-VNT solves this with a built-in fault indicator you can wire directly into your EFIS or connect to a 24V LED panel light. You get a real-time alert on your control panel — not a surprise on the ramp.
The optional EarthX 5MM24 24V Fault Indicator Light is available as an add-on and makes this integration simple.
Built-In Protection That Works Around the Clock
The integrated Battery Management System (BMS) is always watching. It continuously balances cell charge levels, prevents overcharging, shuts the battery down before it can over-discharge past safe limits, and guards against shorts and temperature spikes. You can fly knowing the battery is managing itself.
And because lithium iron phosphate chemistry doesn't sulfate or corrode, you won't be fighting terminal corrosion or replacing a battery that sat in the hangar all winter. The ETX680-24-VNT can hold a charge for over six months when disconnected.
Compatibility and Charging Requirements
This battery is designed for experimental aircraft with 24-28V electrical systems and a maximum alternator output of 70 amps. Your voltage regulator should be set to 28.8V. If your alternator output exceeds 70 amps, contact EarthX directly before purchasing to discuss a two-battery parallel configuration.
The VNT designation indicates a vented battery design. Vent tubing is required to safely route any gases away from the airframe, and we offer 6 feet of 3/8" tubing as an add-on at checkout.
Ready to ditch the dead weight? Order the EarthX ETX680-24-VNT today and get the battery your build deserves.
Charging System Guidelines
| Alternator/Generator Max Charging Output | Voltage Regulator Settings | # of Batteries Needed |
|---|---|---|
| 70A | 28.8V | 1 |
| 140A | 28.2V | 1 |
| 300A | 27.6V - 28.2V | 2 in parallel |
Frequently Asked Questions
What alternator output is required for the ETX680-24-VNT?
A: This battery is designed for experimental aircraft with a maximum alternator or generator output of 70 amps. Your voltage regulator should be set to 28.8V. If your system exceeds 70 amps, a different battery or a dual-battery parallel setup may be required. Reach out to EarthX at [email protected] if you're unsure what fits your build.
Can the ETX680-24-VNT be used in a turbine-powered aircraft?
A: For turbine applications, two ETX680-24-VNT batteries must be connected in parallel — a single battery is not sufficient for turbine use. We strongly recommend contacting EarthX before purchasing for any turbine application to confirm the correct configuration for your engine and electrical system. For piston engines, a single battery handles engines up to 550ci.
Why does this battery have a vent port, and is the tubing required?
A: Yes, vent tubing is required. The "VNT" in the model name stands for vented — the battery has a port that must be connected to tubing routed safely outside the airframe. This ensures any gas released during a charging event or battery fault is directed away from the cabin and structure. We offer 6 feet of 3/8" vent tubing as an add-on when you add this battery to your cart.
How do I connect the fault indicator to my cockpit or EFIS?
A: The ETX680-24-VNT includes a built-in fault output that can be wired to a 24V LED panel light or integrated into a compatible EFIS. The optional EarthX 5MM24 24V Fault Indicator Light is a simple panel-mount LED designed to work directly with this battery. Full wiring details are available in the product manual, which can be downloaded from this page.
