Up to 50% of vehicles are coming into garages with discharged batteries, research from CTEK has suggested. According to the cross-European survey of 700 workshop employees carried out by the battery management specialist, between three and five out of 10 cars arrive at garages with a battery issue. Meanwhile, another recent study performed by a battery manufacturer suggested that over 85% of warranty claims stem from a lack of charge or poor maintenance by customers, leading to battery sulfation. Things don’t always improve once a car is in the garage either, as CTEK Sales Manager Mark Poole noted: “During the servicing process, it has been observed that a vehicle's battery can lose up to 10% of its charge whilst in the workshop. It is worth noting that battery charge levels can significantly decrease in just a few days of non-use, reaching dangerously low levels. According to the cross-European survey of 700 workshop employees carried out by the battery management specialist, between three and five out of 10 cars arrive at garages with a battery issue. Meanwhile, another recent study performed by a battery manufacturer suggested that over 85% of warranty claims stem from a lack of charge or poor maintenance by customers, leading to battery sulfation. Things don’t always improve once a car is in the garage either, as CTEK Sales Manager Mark Poole noted: “During the servicing process, it has been observed that a vehicle's battery can lose up to 10% of its charge whilst in the workshop. It is worth noting that battery charge levels can significantly decrease in just a few days of non-use, reaching dangerously low levels.