EFB Batteries: Everything You Need to Know

06 May.,2024

 

EFB Batteries: Everything You Need to Know

As environmental concerns escalate worldwide, so does the desire for electric vehicles. In South Africa alone, it’s predicted that the demand for lithium-ion batteries will continue to increase in the forthcoming years. As such, they’ll need better options to handle how an electric car functions.

For more what is an enhanced flooded batteryinformation, please contact us. We will provide professional answers.

EFB batteries are one such product that functions well with start-stop vehicles. Although they aren’t lithium-based, they’re considered an improvement over normal flooded lead-acid batteries. At the same time, they’re considered an entry-level option.

Here is your EFB battery guide and why you might choose them over the alternatives.

EFB Batteries 101

So what makes these types of batteries different from the other options in the market?

Enhanced flooded batteries (EFB) work much like other lead-acid batteries. The lead dioxide and acid inside the case generate a chemical reaction. An electrical charge is replenished by reversing this reaction.

Over time, the generated charge becomes weaker due to fewer sulfate ions in the acid.

EFB technology differs from other lead-acid batteries in that they utilize liquid electrolytes inside of them. Lead plates are another distinctive feature that absorbs and retain liquid electrolytes when combined with microfiber material.

The end result is a product that lasts longer and reduces the need for battery maintenance.

If your current car battery is failing, it may be a good idea to switch it with an EFB. These are especially good for start-stop vehicles, as they can handle deep discharges and have a larger capacity.

They’re an especially reliable option for entry-level vehicles due to their lower cost than other batteries on the market.

EFB vs AGM and Standard Batteries

EFBs aren’t the only option for your start-stop vehicle, though. The other option you may want to consider is an AGM battery. These differ from the former in how they function, the kind of electrical demands they can handle, and how well they charge.

Design and History

AGM, or Absorbed Glass Mat, batteries work just like standard batteries, except they have a fibreglass mat between the negative and positive plates. The electrolyte passes through the mat in a controlled manner without any danger of flooding it.

This also means that no free liquid will come out if the battery casing is broken. However, AGM batteries may have issues with extreme heat due to how little electrolyte is flowing through them.

These batteries have been around since the 1980s, and there are various options.

Meanwhile, the first EFB battery was released in 2008 to reduce fuel consumption and emissions. Although it is newer, it may not be the best option for your vehicle.

For example, your car may have been functioning perfectly well for years with an AGM battery. It wouldn’t make sense to switch it to an EFB then, as it may work best with the type it came with. However, you can always upgrade your standard battery for either one to see some improvement.

Start-Stop Functionality

One mechanism standard batteries struggle with is the newer start and stop engine systems. These systems work to reduce fuel consumption in high-traffic situations by managing when your engine runs.

In vehicles with this system, the engine stops whenever the vehicle comes to a stop as a result of the driver pressing on the brake. The engine then restarts when your foot is lifted off of the brake, allowing the vehicle to once again accelerate.

The problem with this system comes into play when you’re in heavy traffic on the highway. It’s not uncommon for a driver to have to continuously break and accelerate when dealing with bumper-to-bumper traffic. Things move at a slow pace, and this kind of encounter could go on for a while.

A conventional battery cannot handle this kind of strain and will likely stop working in a matter of months.

Meanwhile, both EFB and AGM batteries are well-suited for start-stop engines.

Charging

Both EFB and AGM batteries require special chargers in order to avoid overcharging them. The voltage shouldn’t exceed 14,4V. It’s important to check the battery case for things like ideal operating conditions and allowable charging voltage.

Always stop charging when the indicator goes down to 2,5A. Certain chargers may also have built-in control systems to prevent overcharging.

Benefits and Drawbacks of EFB Batteries

So what is it about EFB batteries that make them worth your investment? And are there any problems they have that might make you choose a different option?

One of the benefits of EFB technology is that it can deliver a starting current of up to 550A. In comparison, a conventional battery can only get up to 300A.

They last longer than standard batteries and charge much more quickly. You can expect good performance in colder weather. It’s even safe to store them for a couple of years without them suffering a significant loss in storage capacity.

As previously mentioned, EFB batteries are suitable for start-stop engine systems. They can handle the daily stressors of the modern roadway much better than standard batteries.

One of the problems with EFB batteries is that they have strict charging conditions. It’s all too easy to overcharge and damage them by boiling the electrolyte. In addition, AGM batteries are more powerful and may have more appeal to some vehicle owners.

Buying the Right Batteries for the Job

If you’re not sure what type of battery your vehicle should get, you can’t go wrong with EFB batteries. They work well with start-stop vehicles, resist corrosion, and are protected from the elements. There’s no need to worry about maintaining them or developing electrical or fluid problems.

Contact us to discuss your requirements of camel trucks. Our experienced sales team can help you identify the options that best suit your needs.

RB Battery aims to provide the best battery supplies online. Our product line includes EFB & AGM batteries, marine batteries, dry-charged batteries, and more. Contact us with any queries, and we’ll get back to you within 24 hours.

AGM & EFB Automotive Batteries Explained

AGM & EFB Automotive Batteries Explained

AGM Explained

  • Improved active mass efficiency, through better absorption of the acid
  • Increased lifespan due to minimal active material shedding due to battery design
  • Higher cold start values
  • Totally Maintenance Free – zero water consumption
  • Spill proof/leak proof
  • Designed to meet latest OEM vehicle demands
  • Compatible with sensitive electronic equipment
  • AGM technology now factory fitted to numerous luxury cars and “Stop – Start” vehicle where increased AGM battery features are required

Yuasa’s world leading motorcycle and industrial AGM (absorbent glass mat) technology comes to the automotive market. The Yuasa automotive AGM battery has been engineered to meet the growing extreme power demands of recently introduced vehicles now starting to enter the European aftermarket. Yuasa’s automotive AGM experience comes from vehicles such as the Mazda MX5 and the famous Toyota Prius and has now been launched for European vehicle battery designs.

The new Yuasa AGM European 096 and 019 sized batteries provide reliable starting whilst coping with the extreme power needs of the modern vehicle. Laboratory evaluation is boasting 4-5 times the cyclic durability of standard conventional flooded product and typically 16% higher starting power, even at lower temperatures. Increased reaction surface area ensures increased energy densities for faster engine rotation during starting and therefore maximising fuel efficiency.

The AGM batteries utilises the same absorbent glass mat technology as used in Yuasa Motorcycle and Industrial batteries which have been on the market for over 44 years (1965). This absorbent glass mat absorbs the battery’s acid, enabling a more efficient use of the cell’s volume without the need for electrolyte reservoirs, as needed with conventional flooded batteries. The absorbent glass mat gives a number of key benefits to the design of the lead acid battery:

  • Within normal operating conditions, the use of the individual cell valve design and glass mat plate separation ensures gas recombination occurs and ensures that no water is lost therefore negating the need for electrolyte reservoirs and freeing the user from maintenance.
  • One way venting system providing partial pressure in each cell ensuring 100% leak proof and safe handling.
  • The acid absorption of the glass mat means that the battery packs can be operated under higher pressures than conventional flooded batteries this has benefits including significantly prolonging battery cycle durability by minimising paste shedding.
  • The increased pack pressures of the AGM battery increase the batteries resistance to vibration.
  • More reaction surface area ensuring higher starting capacity within the same footprint as conventional ?flooded batteries.

Frequently Asked Questions

Q. What are the differences between flooded and AGM Lead Acid batteries?
A. See above, AGM batteries are built using a glass mat separator which enable all the electrolyte required by the battery to be stored within the glass mat, also allowing any gasses given off during charging to be recombined into water meaning that the batteries are totally maintenance free. The design benefits of the glass mat over conventional flooded batteries enable the battery pack to operate under higher pressure without the fear of insufficient electrolyte between the plates, leading to the step change in durability offered by AGM batteries over flooded. The quality of the glass mat is a critical item in ensuring the optimum life of the battery versus its application. This experience has been gained by Yuasa from over 44 years experience in the field using this technology. The automotive application battery designs are balanced with greater high rate starting performance and cycle life for the increased service/technological requirements of modern vehicle designs.

Q. What are the differences between GEL and AGM (starved) batteries?
A. Both are recombinant batteries (i.e. under normal operating conditions they recombine the gases given off during charging to form water) and both are classified as sealed valve regulated.

The major difference is that in the AGM, the electrolyte is fully soaked into a special absorbed glass mat separator which immobilises the acid, whereas in the GEL batteries the acid is mixed with Silica to form a GEL also immobilising the acid. The benefits of AGM over GEL are that with the use of absorbed glass mat, the battery pack can be operated under a greater operating pressure so improving cyclic durability. With GEL, similar pack pressure can not be used so durability is usually provided by increased paste density which is good for life but not as good for high rate startability performance as required for automotive applications.

Q. Why is charging voltage so critical to both GEL and AGM batteries?
A. Charge voltage is critical with these types of batteries as both are recombinant batteries. This means that the oxygen that is normally produced on the positive plate in all lead acid batteries recombines with hydrogen given off by the negative plate. The recombination of the hydrogen and oxygen produces water, which recycles back to the battery acid, therefore the battery is maintenance free and does not need topping up.

The sealing vent used in the design ensures that a positive internal pressure is maintained to ensure the recombination of the gasses occur and not allow the cell ?to dry out and fail.

In addition, the valve must safely release any excess pressure that may be produced during overcharging ?(e.g. alternator rectifier fault), otherwise the cell would be irreversibly damaged. The excessive pressure that the valve is releasing is both hydrogen and oxygen which can not recombined within the battery so breaks the cycle, ?net result is that battery would eventually dry out.

It must be noted that an AGM battery must never be opened once it leaves the factory, as sulphation could occur on the plates leading to an irreversible loss in performance.

Gel batteries are more critical to correct charging as overcharge can lead to the gel being irreversibly damaged, AGM are not subject to this failure mode and hence are more suitable for automotive use.

Q. Can I store my AGM battery in my garage during the winter or will it freeze?
A. As with flooded batteries, providing the batteries are kept ?in a charged state, batteries can be stored without any fears of freezing.

Q. Can I store my AGM battery on the garage floor?
A. Many people have the impression that when batteries sit on concrete the energy “leaks out”, the truth is that you can let any modern battery sit on concrete without fear of harm or accelerated self discharge.

This myth stems from the days of the old wooden/glass case batteries, where damp floors led to water soaking up into outer wooden cases causing swelling of the wood. In fact with modern batteries in hard plastic cases, concrete is generally an excellent surface on which to store a battery. The key issue is that the floor should not have any sharp objects which may damage the battery casing; there are no electrochemical reasons.

Q. Do AGM batteries have a memory?
A. No, this is only a function of Nickel Alkaline Battery system such as Nickel cadmium.

EFB Explained

Also known as AFB (Advanced Flooded Battery) and ECM (Enhanced-Cycling-Mat)

Yuasa EFB (Enhanced Flooded Battery)

  • Designed to meet the latest OEM vehicle demands
  • EFB technology is now factory fitted to numerous entry level Start Stop vehicles
  • Increased dynamic charge current acceptance over standard wet-flooded batteries (+170%), due to improved design including special Carbon additives and high charge acceptance envelope type separators
  • Increased cyclic durability over standard wet-flooded batteries (+100%)
  • Sealed tip/tilt double lid with integrated flame arrestor

Improved flooded battery technology, increasingly referred to as EFB technology in the market, offers a cost effective solution for entry level Start-Stop vehicles. EU emissions targets for these vehicles are lower than those set for higher performance models. This has led to manufacturers developing a battery technology that meets the demands of Start-Stop operation in a higher state of charge than expected from AGM technology, but lower than that expected from standard wet-flooded starter batteries.

To meet the growing demand for OEM specification EFB technology in the European aftermarket, Yuasa has introduced 11 new EFB battery types with the launch of the YBX7000 Start Stop range. This range comprises 5 European (DIN) and 6 Japanese (JIS) battery sizes to maximise coverage of vehicles in the UK parc.

In addition to Start-Stop, Yuasa EFB batteries are well suited to use in demanding applications. In repetitive deep discharge scenarios, such as those common to Police vehicles and Taxis, EFB technology offers improved cyclic durability, when compared to premium wet-flooded batteries.

Frequently Asked Questions

Q. What are the differences between standard flooded and EFB batteries?
A. EFB batteries are an enhanced version of standard wet-flooded technology. The primary benefits of EFB technology are improved charge acceptance and greater cyclic durability when operating in a reduced state of charge (typical of Stop Start applications). As an approximation, EFB batteries will provide 270,000 engine starts, compared to 30,000 starts from standard flooded product.

Q. What are the differences between EFB and AGM batteries?
A. EFB batteries have been introduced as a lower tier option to AGM batteries in terms of performance and durability. EFB technology relies on improvements to existing flooded technology through the addition of Carbon additives in the plate manufacturing process. AGM batteries benefit from the inclusion of unique design features not found in wet-flooded batteries. These include glass mat separators, recombinant lid technology and higher pack pressures to facilitate improved cyclic lifespan. AGM batteries are better suited to meeting the demands of higher specification vehicles that include one or more of the following technologies: Start Stop, Regenerative Braking and Passive Boost.

Q. Can I store my EFB battery in my garage over winter or will it freeze?
A. Providing that the battery is kept in a charged state, it can be stored without any fears of freezing.

Q. Can I store my EFB battery on a garage floor?
A. You can let any modern battery sit on concrete without fear of harm or accelerated self-discharge. Concrete is generally an excellent surface on which to store a battery. The key issue is that the floor should not have any sharp objects which ?may damage the battery casing; there are no ?electrochemical reasons.

Q. Do EFB batteries have a memory?
No, this is only a function of Nickel Alkaline Battery systems such as Nickel cadmium.

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