How to Save Money When Buying flooded truck battery

Article overview

• Battery Basics: Explains differences between AGM (Absorbent Glass Mat) and flooded lead‑acid batteries, focusing on design and how each stores and delivers power.
• Maintenance & Performance: AGM batteries are sealed, spill‑proof, low‑maintenance, and perform better in high‑heat and high‑demand situations compared to standard lead‑acid batteries, which need regular upkeep.
• Cost & Lifespan: AGM batteries cost 40–100% more but can last longer (up to 10 years) and recharge faster, while lead‑acid options are cheaper with a typical 3–5 year lifespan.
• Environmental Impact: Both battery types are recyclable, but AGM’s sealed design offers slightly lower ecological risk and easier handling.
• Ideal Use Cases: AGM batteries are recommended for modern vehicles with high electrical loads, hot climates, or drivers who want low maintenance; lead‑acid works for budget‑focused, standard vehicle needs.

Two options stand out in the world of automotive batteries: absorbed gas mat batteries and lead acid batteries. While both serve the same purpose of storing and delivering electrical energy and share the same chemistry, their construction, performance and applications differ. Understanding the distinctions between these types can help consumers make informed decisions. 

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What is a regular lead car battery?

Also called flooded batteries, regular lead acid car batteries are the most common in cars, trucks and vans. Divided into six separate cells with positive and negatively charged plates, a flooded battery contains a liquid electrolyte solution that each plate is submerged in to create a path for electricity to flow through. 

A lead acid battery relies on this solution of liquid electrolyte to operate. Without it, limited chemical reactions hamper the communication between the lead plates. This significantly reduces the battery's capacity and voltage output, making it unable to provide the necessary power to start the car or run the electrical system. Operating a flooded car battery without enough electrolyte can also damage the internal components of the battery and might lead to corrosion. Flooded batteries also need to be stored in well-ventilated areas of the vehicle, since they release gases into the atmosphere. 

What is an AGM car battery? 

Designed to provide more amps even if the car engine is off, absorbed gas mat (AGM) batteries are becoming more common in the industry. Instead of holding freely flowing electrolytes, AGM car batteries have a glass mat separator between the lead plates. Designed to absorb and immobilize electrolytes, the glass mat prevents spillage even if the battery is cracked or damaged. This design also has pressure relief values to regulate internal pressure and to avoid gas buildup, making AGM batteries ideal for use in vehicles with batteries in the trunk or under seats. 

AGM batteries require less maintenance than flooded batteries and are generally considered maintenance-free. Because the electrolyte is enclosed in the glass mat, these batteries can be mounted in various orientations without risking electrolyte leakage.

The differences in power output of AGM vs. lead

A battery’s internal resistance can affect its performance. The internal resistance of an AGM battery can be as low as 2%. In comparison, a flooded battery can have an internal resistance of 10-15%. The lower internal resistance means an increased battery voltage output while helping AGM car batteries recharge faster. This is important in help the battery recover quickly from deep discharges commonly occurring in hot weather conditions or because of the abundant technology in newer cars. 

Speaking of hot weather, regular lead batteries work well in any climate. However, using an AGM battery is best for those living in climates consistently above 80 degrees Fahrenheit. Exposure to high temperatures can cause car batteries to have increased electrolyte evaporation, reducing the battery's performance and lifespan. In addition, heat causes corrosion buildup and sulfation (crystal accumulation) on the battery plates. Since AGM batteries have the plates encased, these effects of heat are minimized.

Which is more expensive, AGM or lead car batteries? 

Initially, an AGM battery will cost more than a regular lead acid battery. The cost can be significant, in fact, as much as 40 to 100% more than the cost of a regular lead battery. 

Flooded batteries can last three to five years with regular maintenance and proper care. This lifespan will vary based on factors such as temperature, battery quality and cycling frequency. If the battery isn't maintained or lives in harsher conditions, that lifespan can drop from one to two years.

Owners can expect an AGM car battery to typically last between three and five years with proper usage. With its sealed design, internal components are protected from contamination and electrolyte loss, which contributes to its longevity. In some cases, higher-quality AGM batteries may last up to 10 years, depending on the application and environmental conditions. Also, AGM batteries are maintenance-free and eliminate the need for regular electrolyte checks and refills that are commonly required for flooded batteries. 

Below are tips for getting the best battery for your needs:

Be Proactive
Being attentive to your battery’s maintenance and mindful of when it’s time for a replacement will ensure that you can choose one on your own terms, including properly researching and conveniently scheduling.

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Test Batteries Annually
Inspections should be part of an owner’s routine maintenance, but it’s especially important to check before taking a long road trip.

True maintenance is largely a thing of the past. Almost all of today’s car batteries are “maintenance-free.” But we recommend having your battery load-tested by a mechanic annually once it’s 2 years old if you live in a warmer climate or 4 years old if you live in a colder climate. Doing so tests its ability to hold voltage while being used, and the results will let you know when it’s time to start shopping.

In addition, check the terminals to make sure the connectors are tight and free from corrosion.

Car batteries typically last from three to five years, according to AAA, spanning from 58 months or more in the farthest northern regions of the U.S. down to less than 41 months in the most southern regions.

The battery’s age is also a strong indicator that it’s time to consider a replacement. The date can be found on a sticker on the top or side of the battery. A battery made in October will have a numeric code of 10/24 or an alphanumeric code of K-1. “A” is for January, “B” is for February, and so on. (The letter “I” is skipped.)

A Battery Should Fit Your Car and Driving Needs
Car batteries come in many sizes. Among those that we’ve tested, there’s significant variation in which is the top performer from year to year and from size to size. This makes it impossible to make simple recommendations by brand or model. It also means you shouldn’t assume that buying the same battery model you’re replacing will get you the same results.

Make sure you get the right size and terminal locations (or type) for your vehicle. Check your owner’s manual or an in-store fit guide before buying.

In some cases, owners can replace an AGM battery with a traditional flooded one to boost longevity in hot climates, but it’s best to consult a mechanic first. Many cars come with AGMs to support an increasing array of electrical components, and the charge system may be configured specifically for an AGM battery.

Make Sure It’s a Fresh Battery
Batteries lose strength over time, even when in storage. For optimum performance, purchase one that’s less than 6 months old—3 months is even better. As explained above, most have a shipping code on the case.

Recycle Your Old Battery
A battery’s toxic lead and acid can easily be recycled, and most retailers will dispose of the old one for you. When buying a new battery at a store, you’ll probably pay an extra charge that will be refunded when you return the old battery. This serves to motivate car owners to drop off their old batteries. About 90 percent of car batteries are truly recycled, making them a recycling success story.

Compare Warranties
It’s important to choose a battery with the longest free-replacement period you can get. A battery’s warranty is measured in two figures: the free replacement period and the prorated period—which allows only partial reimbursement. A code of 24/84, for example, indicates a free replacement period of 24 months and a prorated warranty of 84 months. But the amount you’ll be reimbursed usually drops off pretty quickly once you’re in the prorated period.

Be aware that signs of neglect—such as low water levels and improper installation—can void a warranty. Heavy-duty use, such as for high-end car audio and marine applications, can also void a warranty if the battery isn’t recommended for it.

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