The SureCrank TRITON is a three-terminal sodium ion marine starting battery launching in three of the most popular marine sizes — Group 31, Group 27, and Group 24. The SC-31 is first. New chemistry that behaves the way a starting battery should. A new architecture that ensures the engine always has power — no matter what happens on the house side.
Development informed by real‑world marine installations and ABYC electrical principles.
All TRITON models come standard with Bluetooth wireless for our iOS and Android apps. You can monitor individual cell voltage, current state‑of‑charge, and internal temperature of the battery directly from your phone.
The SureCrank TRITON launches in the three most common marine battery sizes. The SC-31 leads — SC-27 and SC-24 follow the same validated three-terminal platform.
Modern boats demand stable voltage, ECU protection, and reliable engine starts — but neither of the two available chemistries can deliver all three. AGM is outdated. LFP is risky. Sodium ion, with the right architecture, fills the gap neither can bridge.
Sodium ion is the right chemistry — but every sodium ion battery on the market was built using the same two-terminal architecture as LFP, with all the same BMS disconnect risks. The industry copied the wrong template. SureCrank TRITON is built differently — and the same architecture scales across all three models: SC-31, SC-27, and SC-24.
The starter circuit needs to be direct and uninterrupted — exactly like a traditional lead-acid battery. So that's how the SureCrank TRITON is built. The start terminal connects straight to the cell stack with no BMS in the path. The house terminal routes all loads and charging sources through a dedicated BMS that monitors cell health, temperature, and balance.
If the BMS detects a fault, it isolates the house side. The starter path is never touched. The engine always has power. The alternator always has a battery connected. A load dump becomes impossible by design.
Direct, uninterrupted connection to the engine. No BMS in the path. No electronics to fail. Behaves exactly like a traditional lead-acid battery during cranking — predictable, stable, and reliable under any conditions.
Always Live · No BMSAll electronics, loads, solar, shore power, and DC-DC converters route through a dedicated BMS. Faults on the house side are isolated here — and never propagated to the starter circuit.
BMS ProtectedThe result: A single drop-in battery that solves the single-battery architecture for small boats and provides a safe, fault-isolated starting circuit for larger vessels — without the load dump risk that makes LFP unsuitable for starting. This three-terminal architecture scales across the SC-31 (Group 31), SC-27 (Group 27), and SC-24 (Group 24).
Sodium ion chemistry behaves almost exactly the way a marine starting battery should. It drops into existing tray sizes, works with existing alternators and charge systems, and doesn't require a complex charging infrastructure to stay safe. After years of developing sodium ion BMS design and power architecture for marine applications, this was the chemistry that checked every box.
Alternators and regulators were designed around a sloped voltage profile. Sodium ion delivers that — unlike LFP's flat curve that causes overcharging and regulator confusion.
Higher internal resistance naturally limits instantaneous cranking current — protecting wiring, solenoids, and alternators from the stress LFP imposes.
Inherently safe chemistry. No thermal runaway risk. No special storage precautions. Safe below deck in any enclosed space.
Performs well in cold conditions — exactly when you need a starting battery to work without hesitation.
Can sit at low or zero state of charge without degradation — unlike AGM, which suffers permanent damage when left discharged.
Dramatically more charge cycles than AGM. A SureCrank TRITON battery should outlast the boats most of them are installed in.
Three-terminal architecture fully defined. Four-cell series configuration engineered to match alternator and ECU voltage expectations. Patent protection filed. Custom low-current BMS designed for the house-side circuit.
Sodium ion starting performance validated. Cranking voltage stability, faster starts, and higher voltage under load all confirmed. The engine ECU no longer sees the sag it experienced with AGM.
First SureCrank TRITON SC-31 (Group 31) pre-production units in assembly. The three-terminal architecture moves from engineering drawings to a physical battery — ready for real-world testing. The SC-31 leads the way; SC-27 (Group 27) and SC-24 (Group 24) follow the same validated platform.
Real-world validation under live marine conditions — cranking performance, BMS fault isolation, and charging behavior with actual alternators and solar systems. Followers on this list hear results first.
Battery transport and safety certification — a required step before any commercial product can ship. Assembly validation runs in parallel.
Email subscribers receive early access and early-backer pricing before the campaign opens to the public. The campaign will offer the SC-31 (Group 31) with the SC-27 (Group 27) and SC-24 (Group 24) platform variants to follow.