MADE IN THE USA!
Free Economy ShippingProduct Specifications for EarthX ETZ5G Lithium Dirt Bike Battery
| BM Part #: | ETZ5G |
|---|---|
| Brand: | EarthX |
| Made In: | U.S.A. |
| Voltage: | 13.2 Volt |
| Cold Cranking Amps: | 140 CCA / 240 PCA |
| Capacity: | 3.4 Ah |
| Energy Capacity: | 44 Wh |
| Type: | LiFePO4 |
| Length: | 3.54" |
| Width: | 1.96" |
| Height: | 3.54" |
| Shipping Weight: | 1.15Lbs |
| Warranty: | 1 Year Factory Direct |
| Product Manual: | Download |
| Datasheet: | Download |
What's in the box:
- 1 x Battery
- 2 x 6mm screws
- Foam for proper fitment
- Made in the USA. Why it matters:
- Superior craftsmanship; rigorously tested; high-quality parts.
- 240 Peak Cranking Amps: Delivers nearly triple the cranking power of most OEM stock dirt bike batteries.
- Cold-Start Engineering: No cutoff during cold or prolonged starts, by design, for reliable snow bike performance.
- Compact G-Case Size: Designed for bikes with tight battery boxes, measuring 3.54" L x 1.96" W x 3.38" H.
- Ultra-Lightweight: Weighs just 1.15 lbs, with significant savings over comparable lead-acid batteries.
- LiFePO4 Chemistry: Lithium iron phosphate cells that won't freeze, spill, or sulfate, season after season.
- Made in the USA: Engineered and assembled domestically with rigorously tested, high-quality components.
Product Description
The EarthX ETZ5G is not a typical dirt bike battery. It's the one EarthX engineered specifically for riders who need maximum cranking power in the conditions that push other batteries to their limits.
Think about the moments when you need your battery most: a freezing morning at the trailhead, a snow bike that's been sitting in the cold overnight, or a stubborn cold-start in the backcountry. Full-BMS lithium batteries can shut themselves off when pushed hard in those situations, a protective feature that becomes a liability exactly when you need it least. The ETZ5G is built differently.
A Battery Designed Around Cold-Weather Cranking
The ETZ5G includes EarthX's Battery Management System, but with one deliberate difference: it does not include over-discharge or excessive cranking protection. That means the battery won't cut out mid-crank on a cold start. It's a design decision — not an omission — that makes the ETZ5G the battery of choice for snow bikes and riders who need a no-excuses start in any weather.
It still protects against overcharge and short circuits, and includes built-in cell balancing. The trade-off is straightforward: more raw cranking availability when conditions are at their worst.
Purpose-Built for the Dirt Bike Battery Box
The ETZ5G replaces OEM stock lithium batteries in modern dirt bikes from Beta, Honda, KTM, Kawasaki, Suzuki, Yamaha, Gas Gas, Sherco, and Husqvarna, delivering nearly triple the cranking power of the factory battery. At 1.15 lbs and measuring just 3.54" L x 1.96" W x 3.38" H, it's compact enough for the tight battery compartments where the larger ETX12A won't fit.
Whether you trail ride, race the track, or run a snow bike conversion, this battery is sized and tuned for the application.
Not Sure the ETZ5G Is the Right Fit?
If you want full BMS protection including over-discharge coverage, or your bike has room for a slightly larger case, take a look at the EarthX ETX12A. It uses the same LiFePO4 chemistry with a complete management system, 4.0 Ah capacity, and a 2-year warranty, making it a strong choice for general powersports use.
The ETZ5G ships with two 6mm mounting screws and foam for proper fitment. Order today with free standard shipping to the contiguous 48 states.
Typical Charging Times
| Charging Amps | Charging Time |
| 1 amp | 3 hours |
| 2 amp | 1.45 hours |
| 3 amp | 1 hour |
Frequently Asked Questions
What's the difference between the ETZ5G and the ETX12A?
A: Both are EarthX LiFePO4 batteries, but they're built for different priorities. The ETZ5G is lighter (1.15 lbs), more compact (3.54" x 1.96" x 3.38"), and puts out 240 Peak Cranking Amps. Its BMS intentionally omits over-discharge and excessive cranking protection so it won't cut off during cold or extended starts — that's the feature, not the flaw. It carries a 1-year warranty. The ETX12A is slightly larger (4.5" x 2.6" x 3.7") and heavier at 1.3 lbs, with 220 Peak Cranking Amps and a full BMS that adds over-discharge and heat protection. It comes with a 2-year warranty and is the better fit for general powersports use. If you're not regularly riding in freezing conditions and want the added protection, the ETX12A is worth comparing before you decide.
Will the ETZ5G fit my dirt bike?
A: The ETZ5G is a G-case battery measuring 3.54" L x 1.96" W x 3.38" H. It's a direct replacement for a wide range of OEM part numbers including YTX4L-BS, YTX5L-BS, YTX7L-BS, YTX7A-BS, YTZ5S-BS, YTZ7S, YTZ8V, YT7B-BS, YB7-A, YB7L-B, YB7C-A, HY 85S, and HY 93-C. It also replaces original equipment lithium batteries found in many modern dirt bikes, including the Samsung C22S, Eliiy Power HY93-C, and HUTZ5S-FP. Check the full cross-reference list on this page to confirm your fitment before ordering.
Does the partial BMS change how I need to store and care for this battery?
A: Yes, and this is the most important thing to understand before purchasing. Because the ETZ5G does not include over-discharge protection, you'll want to avoid leaving it connected to a vehicle with an ongoing power draw — like a GPS unit or alarm — for extended periods, as this can drain the cells below safe levels without any automatic shutoff. During the off-season, store the battery with a full charge and use a LiFePO4-compatible smart maintainer to keep it healthy. If your bike tends to sit for long stretches between rides, the ETX12A's full over-discharge protection makes it a more forgiving option day to day.
Does this battery only work well in cold weather, or is it a good year-round choice?
A: It's a strong year-round battery. The cold-weather advantage is simply that it won't shut itself off during a hard or prolonged start the way a fully protected lithium battery might. In normal warm-weather riding conditions, you get all the usual benefits of lithium: a powerful, lightweight, fast-charging battery that starts your bike reliably. The cold-weather engineering is a bonus for demanding conditions, not a limitation in others.
What kind of charger does the ETZ5G need?
A: The ETZ5G works with most modern smart chargers compatible with LiFePO4 (lithium iron phosphate) chemistry. No special balancing charger is required, as the built-in BMS handles cell balancing automatically. Because this battery lacks over-discharge protection, using a LiFePO4-compatible smart maintainer during storage is especially important to keep the cells in good shape. Avoid older chargers with automatic desulfation or recondition modes, as these can push voltage beyond safe limits for lithium chemistry.
Cross Reference & Compatibility
Popular Fitments
The ETZ5G is a direct replacement for the small OEM lithium battery found in most 2017 and newer dirt bikes from the major manufacturers. Below are the most common applications — always confirm against your own application before ordering.
KTM
- 250 SX-F (2017–present)
- 450 SX-F (2017–present)
- 350 EXC-F (2017–present)
- 500 EXC-F (2017–present)
Husqvarna
- FC 250 (2017–present)
- FC 450 (2017–present)
- FE 350 (2017–present)
Honda
- CRF250F (2019–present)
Gas Gas
- EC 250F / EX 250F (2021–present)
Beta
- RR 350 4T (2014–present)
Not seeing your bike? The ETZ5G replaces a wide range of OEM part numbers — check the full cross-reference list or contact our team and we'll confirm your fitment.
Customer Reviews
This is the second one of these batteries I’ve bought. Punches above its class in starting power and reliability. I use this to start a 650 twin and also a Honda xr650l single and it’s never failed me. The built in self protection features are also a bonus
