New ABYC compliant Outboard sodium Ion STARTING battery with 10 times the life of AGM.

The three-terminal design solves a fundamental problem with modern battery chemistries like sodium-ion and lithium: regulatory compliance requires Battery Management Systems (BMS) for protection, but ABYC marine standards require that starting circuits remain non-interruptible. You can't have both with a traditional two-terminal battery. With older lead-acid batteries, this wasn't an issue—they had no electronics. But modern chemistries need intelligent protection systems. SureCrank's three-terminal architecture is how you conform to both requirements: one positive terminal connects your STARTER directly to the cells with zero interruption (ABYC-compliant), while the second positive terminal connects your HOUSE loads through a protective BMS (modern chemistry protection). This isn't just clever engineering—it's becoming the standard way to properly integrate modern battery technology into marine systems that require both safety and reliability.

ABYC (American Boat & Yacht Council) sets safety and design standards for marine electrical systems. ABYC E-11 requires that starting circuits remain non-interruptible—meaning no electronics or BMS should be able to prevent your engine from cranking. SureCrank's three-terminal design follows this guideline: your starter gets a direct connection that can never be interrupted. This matters because: (1) Marine surveyors look for ABYC-compliant installations when inspecting boats, (2) Professional installers trust designs that follow established standards, (3) Insurance companies recognize proper marine electrical design, and (4) You get the peace of mind knowing your battery is engineered the right way, not just the convenient way.

Yes. Same Group size (24, 27, or 31), same terminal posts, same voltage (12.8V nominal), works with your existing alternator. The only difference is you have two positive terminals instead of one—which makes installation simpler, not harder. Your starter and alternator connect to one terminal, your accessories and solar charge controllers connect to the other. No isolators, no combiners, no battery switches needed.

No. SureCrank works with your stock alternator and standard marine battery chargers. Unlike lithium batteries, there are no compatibility issues or required upgrades. Your alternator connects directly to the STARTER terminal with no BMS in the charging path, so there's no risk of BMS disconnection during charging.

Sodium-ion cells are rated for over 3,000 cycles to 80% residual capacity. For typical marine use (weekend boating, seasonal charging), that translates to 30+ years of service life. That's 10× longer than AGM batteries which typically last 3-5 years. We back this with a 7-year warranty.

Yes. Unlike lithium-ion, sodium-ion has a very low thermal runaway risk. It's inherently stable, UN 38.3 transport certified, and built to marine safety standards. Sodium-ion chemistry doesn't suffer from the same thermal stability issues as lithium-ion, making it actually safer than lithium while delivering similar performance benefits.

Yes—this is a major advantage of sodium-ion chemistry. SureCrank can safely discharge to 0% without damage, unlike lithium batteries which fail if deeply discharged. You can store it for months or even years, then charge it back up and use it normally. AGM batteries sulfate if left undercharged and become permanently damaged—sodium-ion doesn't have this problem. Plus, we can ship SureCrank de-energized for maximum safety. There's no fire risk in storage like you'd have with LFP or lithium batteries. Perfect for seasonal boaters or winter storage.

Absolutely. SureCrank delivers 1100 cold cranking amps (DS-27) and maintains strong performance in sub-zero temperatures. Sodium-ion handles cold weather better than AGM at low states of charge, so you'll get reliable starts even in winter conditions.

Real-time voltage, current flow, state of charge, temperature, and cell balance status. You'll also get alerts if anything unusual is detected (overvoltage, undervoltage, temperature abnormalities). The app is available for both iOS and Android. The BMS monitors your battery health continuously and only disconnects the HOUSE terminal if a fault is detected—your starting circuit is never affected.

Yes! Your solar charge controller connects to the HOUSE/Accessories terminal along with your other accessories. This terminal is fully BMS-protected against voltage and temperature abnormalities. The BMS ensures safe charging from solar without any risk to your battery cells.

If the BMS detects a voltage or temperature fault on the HOUSE terminal, it will disconnect only the house loads (accessories, solar chargers, etc.). Your critical starting circuit, alternator charging, and ECU remain completely unaffected because they're on the separate STARTER terminal with direct connection to the cells. This means you'll always be able to start your engine and get home safely, even if there's an issue with your accessory loads.

No. Your existing cables will work fine. The terminal posts are standard automotive/marine size. You'll just be connecting them to different terminals: your starter cable goes to the STARTER terminal, and your accessory/house cable goes to the HOUSE terminal. It's actually simpler than most battery installations.

We offer three Group sizes: DS-24 ($499) for boats up to 22 feet with engines up to 150 HP, DS-27 ($575) for boats 22-26 feet with engines 150-250 HP, and DS-31 ($649) for boats 26-30+ feet with engines 250-400+ HP. Check your current battery—it will have the Group size printed on the label. If you're unsure, measure your battery box or contact us.

Every SureCrank battery includes: the battery with three-terminal configuration, built-in Bluetooth monitoring, installation guide with wiring diagrams, 7-year warranty, free shipping, and 60-day money-back guarantee. You also get access to our support team via email for any installation questions.