Technical data: Capacity: 3500mAh / 37.8Wh Voltage: 10.8 Volt Cell type: Li-Ion Brand: PATONA PROTECT The battery is suitable for the following models: Nikon Z9 This battery replaces the following original battery types: EN-EL18D Our PROTECT series batteries are new and exclusive to PATONA. These are characterized by a housing that is fire-retardant and extremely heat-resistant. The battery housing is made of fire-retardant V1 material and guarantees resistance to housing temperatures of up to 90 degrees without deforming. In addition, only selected branded high-performance cells are used for the battery. The PATONA PROTECT series is the new revolution on the battery market, combining extremely high safety and performance with a long service life. Furthermore, as with the original battery, NTC resistors (negative temperature coefficient) are fitted to the battery circuit board to control the temperature and switch off automatically in the event of overheating.