Special featuresLiHD battery packs for ultimate performance and extremely long runtime with minimal temperature development Intelligent battery management for long-lasting battery packs with a 3-year warranty Patented "AIR COOLED" charging technology Permanent electronic individual cell monitoring (ESCP) when charging, for a very long service life Processor-controlled charging and discharging management. Capacity display for checking the charge status Can be stored for long periods with virtually no self-discharge Included as standardBattery pack voltage 12 V Battery capacity 4 Ah Weight 320 g