 Due to the higher manufacturing costs compared with flooded lead–acid batteries, AGM batteries are currently used on luxury vehicles.As vehicles become heavier and equipped with more electronic devices such as navigation and stability control, AGM batteries are being employed to lower vehicle weight and provide better electrical reliability compared with flooded lead–acid batteries.5 series BMWs from March 2007 incorporate AGM batteries in conjunction with devices for recovering brake energy using regenerative braking and computer control to ensure the alternator charges the battery when the car is decelerating.