EFB Start Stop Battery
Built for modern vehicles with start-stop systems. Crank Max EFB batteries deliver higher charge acceptance, longer cycle life, and greater durability than standard lead-acid batteries - keeping your car powered and ready to roll.
See It From Every Angle.
What Start-Stop Does to an Ordinary Battery
A conventional car battery is designed around a simple pattern: one deep discharge to start the engine, then hours of recharging while the alternator runs. Everything about its plate thickness and grid chemistry assumes that rhythm.
Start-stop systems break it completely. The engine shuts down at every junction and restarts as the driver pulls away, so the battery can cycle dozens of times in a single journey — and during each stop it alone carries the lights, climate control, infotainment and safety systems. It must also accept charge quickly in the short windows while the engine is running. A standard battery put to that work loses capacity fast, and the vehicle eventually disables its own start-stop function to protect itself.
The Crank Max EFB48D26L is built for that duty cycle rather than adapted to it. Enhanced flooded construction with Ca-Ca Silver+ grids and selenium-enhanced plates delivers the charge acceptance the system needs, twice the cycle life of a standard lead-acid battery, and up to eight times the number of engine starts.
Power for Modern Vehicles.
Start-Stop Ready
Engineered for vehicles with start-stop systems - handles constant rapid restarts without affecting performance.
2× Cycle Life
Up to twice the cycle life of standard lead-acid batteries, reducing the need for frequent replacements.
Faster Charging
Higher charge acceptance keeps pace with the energy demands of today's advanced vehicles.
Vibration Resistant
Built to withstand aggressive driving conditions and rough terrain with maximum resilience.
Inside an Enhanced Flooded Battery.
Thicker, Better-Held Plates
EFB construction uses heavier plates with the active material physically held in place, so repeated shallow cycling does not shed it. Plate shedding is what ends the life of a standard battery used in start-stop service.
Ca-Ca Silver+ Grids
Calcium in both positive and negative grids cuts water loss and self-discharge, which is what allows a genuinely maintenance-free battery. The silver addition improves corrosion resistance at the high temperatures found under a modern bonnet.
Selenium-Enhanced Plates
Selenium alloying produces a finer, stronger grain structure in the grid. Stronger grids corrode more slowly, so cranking performance holds up across far more cycles than a conventional plate design manages.
High Charge Acceptance
In stop-start traffic the alternator only gets brief windows to put energy back. Higher charge acceptance means more of that energy is actually stored, keeping the battery topped up instead of drifting into a chronic partial state of charge.
Technical Details.
Built For.
Need Bulk Supply?
Contact our team for fleet orders, OEM partnerships, or distributor pricing.
Get in Touch →Standard, EFB or AGM?
Three battery types cover most modern petrol and diesel cars. Knowing which the vehicle was built for avoids premature failures and warranty disputes.
| Consideration | Standard flooded | EFB (Crank Max) | AGM |
|---|---|---|---|
| Built for start-stop | No | Yes | Yes |
| Cycle life vs standard | Baseline | Around twice | Highest |
| Charge acceptance | Modest | High | Highest |
| Typical cost | Lowest | Mid | Highest |
| Frequent short trips | Struggles | Well suited | Well suited |
| Heavy accessory load | Limited | Strong | Strongest |
As a rule: a vehicle supplied with EFB can be replaced with EFB or upgraded to AGM, but a vehicle supplied with AGM should not be downgraded to EFB or standard. Fitting a standard battery to any start-stop vehicle is the most common cause of early failure in this segment.
Common Questions
Crank Max EFB, Answered.
Start-stop duty, EFB technology, cycle life and distribution — the questions workshops and trade buyers ask most about the Crank Max range.
What is an EFB battery?
EFB stands for Enhanced Flooded Battery. It is a conventional flooded lead-acid battery upgraded for start-stop duty: thicker plates, a polyester scrim holding the active material in place, and improved grid chemistry. The result is far higher charge acceptance and roughly twice the cycle life of a standard flooded battery, at a lower cost than AGM. The Crank Max EFB48D26L is built to this specification.
Why do start-stop vehicles need a special battery?
A start-stop system switches the engine off at every halt and restarts it when the driver pulls away, so the battery may cycle dozens of times in a single journey while still powering lights, climate control and infotainment with the engine off. A standard battery is designed for one deep start per trip and degrades quickly under that pattern. Fitting a standard battery to a start-stop car usually results in premature failure and the system disabling itself.
What does up to 8x more engine starts mean?
It refers to starting cycles rather than calendar life. Crank Max is built to deliver up to eight times the number of engine starts of a standard lead-acid battery before capacity falls away, which is the measure that matters for start-stop vehicles, taxis and delivery vehicles making frequent short trips.
What is Ca-Ca Silver+ technology?
Ca-Ca means calcium is used in both the positive and negative grids, in place of antimony. Calcium grids sharply reduce water loss and self-discharge, which is what makes a maintenance-free battery possible. The silver addition improves the grid's resistance to corrosion at higher under-bonnet temperatures, helping the battery hold performance over more cycles.
Can Crank Max be used in vehicles without start-stop?
Yes. Its applications include high-performance passenger cars, taxis and commercial fleets, ambulances and emergency vehicles, retrofitted electric cars and any vehicle with a high electrical load. Any vehicle making frequent short trips or running heavy accessory loads benefits from the higher charge acceptance, whether or not it has a start-stop system.
Can I distribute Crank Max batteries in my country?
Yes. Tesla Power USA appoints distributors, wholesalers and importers by territory, with West Africa and East Africa currently prioritised. Fleet, taxi and OEM enquiries are handled by the regional team, who will discuss territory, pricing and minimum order quantities.
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Trade buyers can review distributor partnership terms, register a warranty, or contact the regional team.