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Besides the cold, there are 2 main factors for starting difficulties:

- a poorly performing starter battery and

- viscous engine or transmission oil

The battery has the greatest capacity at an ambient temperature of approx.+25 to +27 degrees Celsius.

The colder the temperature, the lower the battery's performance, as the chemical processes take place more slowly. The engine also prefers warm temperatures. The engine oil is thinner and friction is lower. The energy required for starting increases enormously at colder temperatures. Cold starts in winter can be made more difficult by engine oils with a high viscosity. These become increasingly viscous in hard frost and the starter (starter motor) then has a hard time getting the engine moving. Consequently, the highest starting power is needed when the battery has a much poorer capacity due to the temperature.

If you take care of the battery in winter, you can prevent annoying battery failure. Therefore, when starting from cold, switch off the radio, fan, headlights, rear window and seat heating, i.e. all additional power guzzlers, and depress the clutch before starting. To conserve the battery, the energy consumers should also be used as sparingly as possible while driving - with the exception of the dipped headlights, of course, which are particularly important in the dark winter months.

Also helpful: fully synthetic, low-viscosity, low-viscosity engine oil - please always follow the recommendation in the vehicle manufacturer's operating instructions. This oil spreads more quickly and makes the engine run more easily after a frosty night. Positive side effect: according to the manufacturer, synthetic oil can reduce power consumption by up to 25%.

Duracell tip: Stepping on the clutch pedal can make the engine cold start much easier!

In vehicles with automatic start-stop systems, two different battery technologies are basically used, depending on the energy requirement and the required vibration or cycle resistance.

- AGM (Absorbent Glass Mat)

- EFB (Enhanced Flooded Battery)

AGM battery

• AGM - Absorbent Glass Mat: the acid is absorbed into the glass fleece and thus bound.
• = VRLA - Valve Regulated Lead Acid: a valve-regulated lead-acid battery with AGM technology
• Starter and on-board power supply battery for start-stop vehicles with highest energy demand and brake energy regeneration
• for medium and luxury class vehicles
• up to 360,000 engine starts
• Auxiliary battery (BackUp) for start-stop vehicles or electric cars with highest energy demand and brake energy regeneration

AGM technology is mainly used in start-stop systems with the highest energy demand and brake energy recovery. It is primarily used in mid-range and luxury class vehicles. AGM (Absorbent Glass Mat) is a recombination battery. The AGM battery is also used in the commercial vehicle sector, especially in long-distance trucks.

A glass mat separator absorbs the acid and leaves enough pores to allow oxygen diffusion from the positive to the negative plate. At the negative plate, the oxygen combines with lead to form lead oxide. Subsequently, this lead oxide reacts with the sulphuric acid to form lead sulphate, with water as the reaction product. The charge converts the lead sulphate back into metallic lead. The result: no water loss! However, if too much gas is produced due to too high charging voltages or extremely hot temperatures, not all of the gases formed can recombine completely. The pressure in the battery rises continuously until the safety valves open.

Changing an AGM battery

If a motor vehicle is equipped with an AGM battery as standard, it is essential to replace it with an AGM battery. In the same housing and similar performance class.

PS: Slight deviations in capacity or cold start have no effect on safe starting and optimum on-board power supply!

Two different battery technologies are used in vehicles with automatic start-stop systems, depending on the energy requirement and the required vibration or cycle stability.

- EFB (Enhanced Flooded Battery)

- AGM (Absorbent Glass Mat)

EFB battery

• EFB - Enhanced Flooded Battery, the cycle-resistant starter battery with liquid electrolyte.
• = AFB - Advanced Flooded Battery
• = ECM - Enhanced Cyclic Mat
• Running Bull EFB - Starter and on-board power supply battery for vehicles with high energy requirements and simpler start-stop systems or increasingly also used as back-up battery in electric cars
• for small cars up to upper middle class
• up to 270,000 engine starts

EFB technology is used primarily in simpler start-stop systems and generally in vehicles with high energy requirements. Primarily for small cars up to the upper mid-range. The battery achieves high vibration resistance and twice the cycle life (compared to conventional starter batteries). Furthermore, the carbon additives lead to a significant reduction in charging time! The EFB battery is a further development of the conventional wet battery. Special mass additives and the use of a plate scrim (fleece layer) provide additional support for the active mass. If recuperation (recovery of braking energy) is also operated in the vehicle, the EFB battery works artificially at a lower state of charge (SOC State Of Charge at approx. 70%). Depending on the driving profile, a conventional wet battery in this application will be defective within a few months due to the extremely high cyclical load.

Changing an EFB battery

If a motor vehicle is equipped with an EFB battery as standard, this may be replaced with an EFB battery or, under certain circumstances, with an AGM battery. In the same housing and similar performance class.

The start-stop system was developed to reduce CO2 and fuel consumption. In addition to an energy management system and a battery sensor, special start-stop batteries are absolutely necessary to implement this system.

AGM battery

• AGM = Absorbent Glass Mat: the acid is absorbed into the glass fleece and thus bound.
• Starter and on-board power supply battery for start-stop vehicles with highest energy demand and brake energy regeneration
• for medium- and luxury-class vehicles
• up to 360,000 engine starts
• Back-up battery for start-stop vehicles or electric cars with highest energy demand and brake energy regeneration

AGM technology is mainly used for start-stop systems with the highest energy demand and brake energy recovery. It is primarily used in mid-range and luxury class vehicles. AGM (Absorbent Glass Mat) is a recombination battery.

EFB battery

• EFB = Enhanced Flooded Battery: the cycle-resistant starter battery with liquid electrolyte.
• Starter and on-board power supply batteries for vehicles with high energy requirements and simpler start-stop systems or increasingly also used as back-up batteries in electric cars
• for small cars up to upper middle class
• up to 270,000 engine starts

EFB technology is used primarily in simpler start-stop systems and generally in vehicles with high energy requirements. Primarily for small cars up to the upper mid-range.