---
product_id: 23410932
title: "Maxwell ULTRA31/1800 Group 31 Engine Starting Module ESM Battery 12V DC 1800 CCA"
brand: "maxwell"
price: "A$221"
currency: AUD
in_stock: false
reviews_count: 8
url: https://www.desertcart.com.au/products/23410932-maxwell-ultra31-1800-group-31-engine-starting-module-esm-battery
store_origin: AU
region: Australia
---

# 1800 CCA Power 12V Engine Start 21 lbs Durability Maxwell ULTRA31/1800 Group 31 Engine Starting Module ESM Battery 12V DC 1800 CCA

**Brand:** maxwell
**Price:** A$221
**Availability:** ❌ Out of Stock

## Summary

> 🔋 Power Up Your Drive with Confidence!

## Quick Answers

- **What is this?** Maxwell ULTRA31/1800 Group 31 Engine Starting Module ESM Battery 12V DC 1800 CCA by maxwell
- **How much does it cost?** A$221 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/23410932-maxwell-ultra31-1800-group-31-engine-starting-module-esm-battery)

## Best For

- maxwell enthusiasts

## Why This Product

- Trusted maxwell brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Always Ready to Go:** Non-discontinued model means you can count on consistent availability and support.
- • **Seamless Integration:** Perfectly fits Group 31 applications, making it the ideal choice for your engine starting needs.
- • **Lightweight Yet Mighty:** At just 21 pounds, this battery combines portability with robust performance.
- • **Unleash Unmatched Power:** Experience a staggering 1800 CCA for reliable engine starts, even in the harshest conditions.
- • **Engineered for Excellence:** Designed by MAXWELL, a trusted name in battery technology, ensuring longevity and reliability.

## Overview

The Maxwell ULTRA31/1800 Group 31 Engine Starting Module is a high-performance 12V battery boasting an impressive 1800 CCA, designed for reliable engine starts. Weighing only 21 pounds, it offers a perfect balance of power and portability, making it an essential component for any serious vehicle owner.

## Description

The Maxwell ESM is by far the leading ultracapacitor-based engine starting product on the market today and offers unmatched capability in truck starting.

## Features

- Maxwell ULTRA31/1800 Group 31 12v Engine Start Module ESM Battery 1800 CCA

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | MAXWELL |
| Brand | MAXWELL |
| Item Weight | 21 pounds |
| Is Discontinued By Manufacturer | No |
| Manufacturer Part Number | Maxwell Ultra 31/1800 |

## Product Details

- **Brand:** MAXWELL
- **Number Of Cells:** 6
- **Manufacturer:** MAXWELL
- **UPC:** 852538006005

## Images

![Maxwell ULTRA31/1800 Group 31 Engine Starting Module ESM Battery 12V DC 1800 CCA - Image 1](https://m.media-amazon.com/images/I/31xFMEAc4ZL.jpg)
![Maxwell ULTRA31/1800 Group 31 Engine Starting Module ESM Battery 12V DC 1800 CCA - Image 2](https://m.media-amazon.com/images/I/41U25z0UkNL.jpg)

## Questions & Answers

**Q: What watts on this battery?**
A: ESM SPECIFICATIONS (12V)
Voltage Input voltage (B+) 10 - 18 V
Output voltage (max.) 16.2 V
Cold cranking amps1 1800 CCA (3 sec. crank)
Peak power2 32.8 kW
Maximum recharge time 20 minutes (recharge from battery at 10 A)
BCI Group 31
13”L x 6 13/16” W x 9 7/16” H
(330mm L x 173mm W x 240mm H)
Terminals SAE 3/8"-16 UNC, 3 each
Environmental Design for heavy truck battery box environments
Weight 21 lbs (9.5kg)
Current draw 25 A max. (from battery)

**Q: How is it hooked up?**
A: Need to run a separate battery cable that hooks up directly to the starter

**Q: How many kw is that battery**
A: Peak power2 32.8 kW

**Q: Can u mix these batter with lithium battery for solar system?**
A: Don't know the answer to that. The maxwell works great for me .When my engine is shut off I'm running my fridge and sometimes my Espar heater or bunk fan. In the morning the truck starts.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great So Far
*by S***S on April 8, 2021*

As always, time will tell the whole truth, but so far this has worked out perfectly. It is installed on an old F350 7.3L turbo-diesel and the engine now cranks over like a 6-cylinder gas engine! These older engines use mechanical fuel pumps and fuel-injector pumps, so they are extra difficult to start. This truck uses the separate ignition relay starter wiring method, so re-wiring from battery start to ESM start was quite easy. BCI Group-31 is technically too large for F550 and smaller trucks, but I always am able to force them in. Non the less, even group-31 AGM batteries don't last very long here in Phoenix.The truck now has one "Main Battery" + the ESM instead of two parralleled batteries. Now the main battery NEVER does any heavy lifting and gets charged individually so it should last much longer than the traditional parrallel wiring method. Like a LifePO battery, the ESM must be current limited charged so I do have concerns if the engine should ever have problems firing up and where to require multiple starting attempts, because the ESM does not store very much "current capacity" (Amp hours) in the capacitors. I suspect that it only stores enough energy to crank the engine 2-3 times and then will run out of power and have to be recharged either by the "main battery" over time, or by a separate shore charger over time. Jump starting CANNOT be done with the ESM wired to the starter!! Make sure that you understand this! You would have to remove the cable from terminal #3 and attach jumper cable to the starter cable. Yikes.Regarding other buyers problems with warranty claims: I called Maxwell and they confirmed that this product MUST be purchased from, Mack, Peterbuilt, Kenworth or Volvo in order to maintain product supply chain confirmation. I tried for days to reach one of those manufactuer retailers and NOT ONE would return my email or provide a retail outlet website for this product. I bought from Amazon and purchased the extended warranty hoping that I won't get screwed by that warranty if I should need a claim service.It is noteworth to point out that in theory this is a solid improvement in technology and moves older trucks into the 21st century. Over the road trucks have been using this technique for several years. Some newer small and hybrid cars are using similar ultra-capacitors too, so this is not some odd-ball or difficult to use system like Brown's Gas injection, etc.I'll try to do a followup in a year or so.

### ⭐ Junk & Maxwell won't back it if bought from Amazon
*by J***R on July 28, 2019*

Bought this module & installed in January 2019, kept discharging randomly. I contacted Maxwell Tech Support, they sent me tests/checks to do all of which came out good. Tech guy says try warranty claim, they tell me since I bought it from Amazon they wouldn't cover it. So since it took me over 4 months to finally find out that the negative post was cracked & causing it to discharge it's too late to return it through Amazon. So now I have a $950 piece of plastic junk I can do nothing with! I don't recommend this product!!

### ⭐⭐⭐⭐⭐ Five Stars
*by A***R on June 16, 2016*

surprised by how well it works on a 15L engine.

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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-02-02*