[Full Guide] What Does 24ms Mean on a Battery

When it comes to batteries, deciphering the various markings can be a puzzling task. Among these enigmatic codes, "24ms" stands out as a common but often misunderstood label. In this article, we delve into the significance of "24ms" on a battery, shedding light on its meaning and implications for users.

Understanding the "24ms" Marking

The alphanumeric code "24ms" imprinted on a battery holds vital information about its specifications. Contrary to popular belief, "24ms" does not signify the battery's shelf life or expiration date. Instead, it denotes the BCI group size, a standardized classification system developed by the Battery Council International.

Decoding BCI Group Size

BCI group sizes categorize batteries based on their physical dimensions, terminal placements, and other defining characteristics. In the case of "24ms," the number "24" signifies the specific group size. This standardized system ensures that consumers can easily identify a compatible replacement battery for their vehicle or marine application.

battery group size

Full Understanding of Group 24 Marine Battery

Group 24 batteries are a common type of 12 volt lead-acid battery used in a variety of applications, including automotive, marine, and recreational vehicles. They are classified by their physical dimensions and have a standard size of approximately 10.25 inches in length, 6.8125 inches in width, and 8.875 inches in height.

Below is a detailed guide covering different aspects of Group 24 batteries, including starting vs. deep cycle, and AGM vs. lithium.

1. Types of Group 24 Batteries

Group 24 batteries can be categorized based on their intended use and internal construction:

A. Starting Batteries

Purpose: Designed to deliver a large burst of power for a short duration to start engines.
Characteristics: High cranking amps (CA) and cold cranking amps (CCA), but lower reserve capacity.
Usage: Ideal for automotive engines, boats, and other applications where quick, powerful starts are needed.

B. Deep Cycle Batteries

Purpose: Engineered to provide a steady amount of power over a longer period.
Characteristics: Lower CCA but higher reserve capacity and amp-hour (Ah) ratings. Can be discharged and recharged many times.
Usage: Suitable for trolling motors, RVs, solar energy storage, and other applications requiring sustained power.

2. Battery Technologies

Group 24 batteries can also be differentiated based on the technology used in their construction:

A. Absorbent Glass Mat (AGM) Batteries

Construction: Uses fiberglass mats to absorb the electrolyte, making them spill-proof and maintenance-free.

Advantages:

Durability: More resistant to vibration and shock.
Performance: Better performance in cold temperatures and faster recharging.
Maintenance: No need for regular water top-ups.

Disadvantages:

Cost: More expensive than traditional flooded lead-acid batteries.

Weight: Heavier due to denser construction.

Sensitivity to overcharging:

As excessive charging can elevate internal pressure, potentially causing the battery to vent or even rupture. Consequently, it is imperative to utilize appropriate charging equipment and methods to prevent such occurrences.

Limited deep cycling capability:

While AGM batteries excel at delivering short bursts of high current, they are comparatively less effective for deep cycling applications. Frequent deep discharges can curtail the lifespan of AGM batteries, rendering them less suitable for certain uses such as off-grid solar systems or electric vehicles that necessitate regular deep discharges.

Temperature sensitivity:

With high temperatures reducing their lifespan and low temperatures diminishing their performance. This sensitivity can pose challenges in environments with extreme temperatures, potentially requiring additional climate control measures to uphold optimal battery performance.

Performance degradation over time:

With their capacity and performance diminishing with each charge-discharge cycle, ultimately necessitating replacement. Factors such as overcharging, deep discharges, and exposure to extreme temperatures can expedite this degradation process.

B. Lithium-Ion Batteries

Construction: Uses lithium-ion chemistry, which is lighter and more efficient. Lithium Group 24 batteries do not have starting function, they are used as deep cycle.

Advantages

Weight: Significantly lighter than lead-acid batteries.
Lifespan: Longer cycle life (can last up to 10 times longer).
Efficiency: Higher energy density and faster charging.
Maintenance: Low maintenance and no risk of acid spills.
Safety: Lithium batteries are generally equipped with BMS (battery management system) to provide protection from over-charging, over-discharging, over-current, short circuit, high temperature or even low-temperature charging cutoff protection.

Disadvantages:

Cost: Higher upfront cost.

group 24 lithium vs AGM battery

Although lithium batteries come with a higher price tag, they offer numerous benefits. Typically, the initial investment for lithium batteries is greater than that of AGM batteries. Nevertheless, many van dwellers and boaters believe that the long-term performance and lifespan of lithium batteries justify the higher upfront cost.

Choosing the Right Group 24 Battery

When selecting a Group 24 battery, consider the following factors:

A. Application Needs

Starting vs. Deep Cycle: Determine if you need a battery for starting an engine or for providing long-term power.

Power Requirements: Check the required CCA for starting batteries or Ah for deep cycle batteries.

B. Environmental Conditions

Temperature: Lithium battery's discharging temeprature is -20℃ to 60℃ (-4℉ to 140℉) while AGM battery can operate in -20°C to 50°C (-4℉ to 122℉). AGM batteries are more sensitive to temperature extremes, while lithium batteries are more tolerant of a wider range of temperatures. This can make lithium batteries more durable in harsh environmental conditions.

Vibration and Shock:

Lithium batteries are generally more resilient to vibration due to their solid-state construction. Unlike AGM batteries, which contain liquid electrolytes and lead plates, lithium batteries do not have these internal components that are as susceptible to damage from vibration. This makes them better suited for applications where vibration is a concern, such as in off-road vehicles, marine vessels, and industrial equipment.
Similarly, lithium batteries are better equipped to handle mechanical shocks. Their solid construction and lack of internal liquid components make them less prone to damage from sudden impacts or shocks, as compared to AGM batteries, which can suffer from internal damage due to physical impacts.

C. Budget

Initial Investment vs. Long-Term Cost: While lithium batteries have a higher upfront cost, their longer lifespan can result in lower long-term costs.

Case Study of Upgrading to Lithium Battery

Josh Sharp, an avid kayak angler, has been using LiTime batteries to power his setup for the past 2 years. He is extremely satisfied with the performance and reliability of the LiTime batteries, which have allowed him to fish extensively without worrying about running out of power, even on long trips. The dependable LiTime batteries have been crucial to Josh's success in several major kayak fishing tournaments in 2023. He highly recommends the quality and value of LiTime's products to other kayak anglers.

“For the last, I'd say about 2 years now I've been running a Newport Vessels NK180 on my Hobie PA14 paired up with my LiTime 100ah. I am beyond impressed and happy with these batteries!! I probably fish more than your average person, averaging around 3 to 4 days a week sometimes more on the water and I put these batteries to work!!! They are 100% dependable and I haven't had my first issue out of them, I've run the 12v 50ah batteries for a while as well and have more than a dozen friends and social media followers who have also jumped on board with LiTime products and couldn't be happier!!!” said Josh.

fishing with litime marine lithium battery

How to Charge Group 24 Marine Battery

1. Selecting the Right Deep-Cycle Battery Charger

When it comes to choosing the ideal deep-cycle battery charger, it's essential to match the charger with the specific battery type. For instance, a lithium battery charger is best suited for charging lithium batteries.

While it's possible to use different battery types and chargers interchangeably, there's a risk that the charger may reach a voltage level that the battery cannot handle. This could potentially lead to battery damage or, at the very least, trigger an error code, preventing the battery from charging.

So, how do you select the appropriate charger? Simply read the charger's description, as it will indicate the type(s) of batteries it is designed to charge.

2. Choosing the Correct Voltage and Amperage

After determining the type of charger required, it's important to select one with the right voltage and amperage. For example, a 12V charger is suitable for a 12V 100Ah battery. Visit the Guide of Lithium Battery Charging Voltage for more detailed information.

lifepo4 battery charging voltage

When selecting the amperage, ensure that the amp hour (Ah) rating of the battery aligns with the amp rating of the charger. Using a charger with an excessively high amp rating can potentially harm the battery. Additionally, a bank charger can be used to simultaneously charge multiple batteries.

3. Charging under the Correct Conditions

Environmental conditions, such as high and low temperatures, can impact marine batteries. While lithium batteries are more resilient, it's important to charge them within a specific temperature range.

4. Safe and Proper Battery Charging: Step by Step Guide

Once you have the appropriate charger, follow these steps to safely and correctly charge your battery:

Ensure that the battery terminals are clean.
Connect the red (positive) cable to the red terminal, followed by connecting the black (negative) cable to the black terminal.
Plug in the charger and turn it on. If using a smart charger, it will automatically stop charging when the process is complete. For Ionic lithium chargers, Bluetooth connectivity allows for easy monitoring. Conversely, most lead acid chargers require setting a timer and disconnecting the charger once the battery is fully charged.
To disconnect, unplug the charger and remove the black cable first, followed by the red one.

By following these steps, you can safely and correctly charge your deep cycle battery, ensuring many more enjoyable adventures out on the water.

LiTime Lithium Group 24 Batteries: A Side-by-Side Look

Capability	Standard	Smart Bluetooth	Smart Bluetooth & Self-Heating
Bluetooth Monitoring	-	✓	✓
Self-Heating Function	-	-	✓
Weight	Approx. 21 lbs	Approx. 21.87 lbs	Approx. 22.71 lbs
Primary Benefit	Essential lithium power, best value	Real-time status tracking on your phone	Uninterrupted charging in freezing temps
Recommended For	Simple lead-acid upgrades in temperate areas	Users who prioritize convenience and data	Adventurers in four-season climates

1. LiTime 12V 100Ah Group 24 Lithium Battery (Standard Model)

The standard Group 24 model is your direct entry into the world of LiFePO4 technology. It delivers the core benefits—lighter weight, longer life, and consistent power—at the most competitive price. It’s the perfect, no-fuss replacement for traditional lead-acid batteries, designed for reliability and simplicity.

Who it's for: Ideal for the user who needs a dependable, cost-effective lithium upgrade for their system and primarily operates in climates where charging below freezing isn't a concern.

Shop Now!

2. LiTime 12V 100Ah Group 24 Battery with Smart Bluetooth

This model builds upon the standard version by incorporating Bluetooth 5.0 technology. This powerful feature lets you connect the battery to your smartphone through the LiTime app, giving you instant access to vital information. Monitor your State of Charge (SOC), voltage, current draw, and more, all from the palm of your hand—no separate battery monitor required.

Who it's for: Perfect for the user who loves data and convenience. If you want to eliminate the guesswork and always know your exact power status, this is the battery for you.

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3. LiTime 12V 100Ah Group 24 Battery with Bluetooth & Self-Heating

The top-of-the-line model in the Group 24 series, this battery has it all: Bluetooth monitoring and a revolutionary self-heating system. While standard LiFePO4 batteries can't be safely charged below 32°F (0°C), this battery's intelligent system automatically activates to warm the internal cells before charging. This ensures safe, efficient charging and reliable power access, even in the dead of winter.

Who it's for: Engineered for the dedicated RVer, mariner, or off-gridder who adventures in cold regions. This battery provides the peace of mind that your power system will perform flawlessly, regardless of the temperature.

Shop Now!

Conclusion

In the realm of batteries, the "24ms" marking holds significance beyond its surface appearance. By unraveling the meaning of this code, consumers can navigate the battery landscape with confidence, ensuring that their chosen power source aligns with their specific needs. Armed with this knowledge, individuals can make informed decisions when selecting and replacing batteries, ultimately optimizing the performance and reliability of their vehicles and equipment.

[Full Guide] What Does 24ms Mean on a Battery