Why do manufactures do it? Reduce CO2 emissions / increase fuel efficiency.
I used to hate it but not anymore.
My wife's Mazda 3 has the feature and its quite non intrusive and seamless.
Its kind of difficult to ignore when the system says XX Kms of extra range is achieved because of YY idle minutes.
The A/C compressor doesn't run when the car is OFF and that can be an issue in hot climates.
Here these cars come with EFB or AGM batteries to cope up with the additional cycles and they cost more than conventional batteries. I don't know about this in India.
More details are available in the following link,
Link:
https://batteryworld.varta-automotiv...ery-start-stop Which is the best replacement battery for automatic start-stop systems?
The energy consumption of modern vehicles is increasing and the increasing number of electronic components and comfort systems puts a great load on the battery. In addition, legal requirements to
reduce CO2 emissions forced manufacturers to introduce automatic start-stop systems.
Only
high performance car batteries such as EFB or AGM batteries can deal with these increased requirements and provide a stable power supply in the vehicle. A battery for a start-stop system can only be replaced with a battery of the same type. In the case of an EFB battery, an upgrade to an AGM may be advisable. However, under certain circumstances, an AGM battery may be suitable for vehicles without start-stop technology.
Car battery Technologies Conventional starter batteries
Conventional lead-acid batteries are tried and tested products, which have been proven in millions of vehicles for decades. These days, almost all batteries are maintenance-free. Beyond a regular check by your workshop in order to detect an imminent failure, no other maintenance is needed.
EFB Batteries
EFB batteries are higher performance versions of conventional starter batteries.
Thanks to the enhancements surrounding the plates with a polyester scrim and an improved formulation of the active material, these can be used more effectively. This also results in a slower increase of the internal resistance of the battery over its lifetime than is the case with a conventional battery. EFB batteries are widely used in vehicles with entry-level start-stop systems, usually without recovery of braking energy.
AGM batteries
AGM batteries score with their high performance and durability. In an
AGM battery, the glass fiber mat which is used as a separator absorbs the electrolyte, which makes it impossible for the battery acid to leak. The plates of AGM batteries are installed with a defined compression. This ensures an optimal connection between the acid and the plates over the entire life of the battery. In addition, the compression prevents the loss of active material and makes the battery especially robust for demanding applications.
AGM batteries are used in vehicles with advanced automatic start-stop systems and recovery of braking energy.
Only replace an EFB with an EFB or AGM battery
Starter batteries with AGM or EFB technology are designed to meet the requirements of vehicles with start-stop systems. Normal car batteries cannot deal with the high demands which occur due to discharge during the stop phases.
Replacement with a normal battery instead of an AGM or EFB, results in rapid deterioration of the battery, and a breakdown is inevitable. For optimum function, a battery must be used, which is compatible with the vehicle’s battery management system. An upgrade from an EFB to an AGM battery is possible and increases the efficiency of the automatic start-stop system and results in increased efficient fuel consumption.
A vehicle with an AGM battery needs and AGM battery
Cars with automatic start-stop systems and energy recuperation create heavy demands on the battery. An AGM battery can also deal with the large number of cycles which are caused by the automatic start-stop system and is also suitable for charging with regenerative braking energy.
An EFB battery is usually used with a higher charge level so that storage of energy from recuperation is not possible, or is only possible to a limited extent. A powerful AGM battery with OEM quality guarantees high reliability and better driving experience.