Metabo 625349000 12v 4.0Ah Li-HD Battery Pack The Metabo 12v 4.0Ah LiHD battery features Metabo\'s \'AIR COOLED\' function. This is their patented principle based on air-cooling the battery pack during the charging process. The battery packs are gently cooled down to the required charging temperature, and then during the charging process are constantly maintained at optimum temperature. With this principle, you get a higher tool life of the battery packs and up to 30% shorter total charging time. FEATURES LiHD battery packs for ultimate performance and extremely long application with minimal temperature generation Ultra M technology: Intelligent battery management for long-lasting battery packs Patented AIR COOLED charging technology Permanent Electronic Single Cell Protection (ESCP) when charging, for particularly long life Processor-controlled charge and discharge management Capacity display with almost no self-discharge SPECIFICATION Battery Pack Voltage: 12v Capacity of Battery Pack: 4.0 Ah Weight: 320 g