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M31-1250 Group 31M True Cranking Marine Battery Wet Cell Maintenance Free, 1000cca 1250mca 160rc
M31-1250 Group 31M True Cranking Marine Battery Wet Cell Maintenance Free, 1000cca 1250mca 160rc
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Ultra-High Output Group 31 Marine Cranking Battery | 1000 CCA
When "enough" power isn't enough, there is the M31-1250, The Ultra-High Output Cranking Battery. This is the apex of starting power, specifically engineered for large-displacement V8 engines, high-compression offshore outboards, and heavy-duty diesel marine plants.
With a massive 1000 CCA and 1250 CA, this battery provides the raw, instantaneous amperage required to turn over the most demanding engines in any climate. While it maintains a standard Group 31 footprint, its internal plate density is optimized for maximum current delivery, making it the most powerful starting battery in its class.
Performance Specifications
| Feature | Specification |
| Voltage | 12V |
| Capacity | 100AH |
| Cold Cranking Amps (CCA) | 1000 |
| Marine Cranking Amps (CA/MCA) | 1250 |
| Reserve Capacity (RC) | 160 Minutes |
| Technology | Maintenance-Free Wet Cell (Lead Acid) |
| Warranty | 12-Month Replacement |
Common Replacement For:
This battery is a premium, high-performance upgrade for standard Group 31 starting batteries. It is a direct fit replacement for:
Interstate Batteries: 31M-EHD, 31-MHD (Extra Heavy Duty series)
Deka / East Penn: 31M9, Marine Master High Output 1000
Duracell (Batteries Plus): SLI31MHD, SLI31HP
Exide / Nautilus: N31HP, Starting 1000
EverStart (Walmart): 31MS-1000, Maxx Marine Group 31 High Output
NAPA: 7234, 7235
Super Start (O'Reilly): 31MHD, 31MS
ACDelco: M31MF (High Output version)
Why the 1000 CCA Model?
Modern marine engines—especially large multi-outboard setups—require significant "surge" current to engage the starter and power the electronic fuel injection (EFI) systems simultaneously.
Reliable Hot Starts: Prevents "voltage sag" that can cause GPS units and electronics to reboot when you crank the engine.
Cold Weather Performance: The 1000 CCA rating ensures your boat fires up even on the coldest mornings of the season.
Maintenance-Free Convenience: Sealed wet cell technology means no fluid checks, keeping your engine bay clean and maintenance-simple.
Dimensions & Fitment
This battery utilizes the large-format BCI Group 31 chassis. Please verify your battery box dimensions to accommodate the extra length:
Imperial: 12.99in (L) x 6.77in (W) x 8.2in (H)
Metric: 330mm (L) x 172mm (W) x 208mm (H)
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Highlights
Introducing the marine battery line by Republic Battery - a family owned and operated business since 1946. Our marine batteries are designed to provide reliable and long-lasting power for all your marine needs.
With decades of experience, we have perfected the art of sourcing batteries that withstand the harsh marine environment. Our marine batteries are made with high-quality materials and are rigorously tested to ensure they can handle the demands of marine use.
Our marine battery line features a range of battery sizes and types, including starting batteries, dual-purpose batteries, and deep cycle batteries. Whether you need a battery for your small fishing boat or a large yacht, we have the perfect battery to meet your needs.
Our marine batteries are designed to provide excellent performance and reliability, even in the most challenging conditions. Our AGM batteries are built to withstand vibration, shock, and extreme temperatures, making them the ideal choice for all your marine needs.
At Republic Battery, we take pride in providing our customers with the highest quality batteries and exceptional customer service. Our marine battery line is backed by a 1 year warranty, so you can have peace of mind knowing that your investment is protected.
Choose Republic Battery for all your marine battery needs and experience the reliability and performance that comes with decades of experience in the battery industry.
Warranty Options
At Republic Battery, we stand behind the quality of our products and are committed to providing our customers with the highest level of satisfaction. We are proud to offer a 1-year warranty on our line of marine batteries.
Our warranty covers any defects in materials or workmanship that may occur during normal use of the battery. If you experience any issues with your marine battery within the first year of purchase, we will replace it free of charge.
The warranty process is extremely simple. If you are having an issue with your battery, bring it by our centrally located store front at 6130 Long Drive, Houston, TX 77087 for a diagnostic check. If you're battery is bad, we will swap it for you at no charge if it is within the warranty period.
Please note that our warranty does not cover damage caused by misuse, abuse, or neglect of the battery. It also does not cover normal wear and tear, or any damage caused by accidents or natural disasters.
At Republic Battery, we take pride in providing our customers with high-quality marine batteries that are built to last. Our warranty is a testament to our commitment to quality and customer satisfaction, and we are confident that you will be completely satisfied with your purchase.
Availability
In-store pick up available at Republic Battery, 6130 Long Drive Houston, TX 77087. Wet cell batteries are not eligible for shipping, but may be eligible for local delivery.
Online inventory may not reflect actual in-store availability, so if a product shows to be low or out of stock you can call us at 713-645-2141 or email sales@republicbattery.com for more information.
A 4th Generation Family Owned and Operated Establishment
- Est. by Charlie Koupa, 1946-