The Sigma BP-81 is a special auxiliary battery for BF series cameras, providing extended recording times and reliable power supply for professional photographers and enthusiasts. This lithium-ion battery has a capacity of 7.2 V and 2000 mAh, delivering consistent performance for long photo sessions, video recording, and continuous use under demanding conditions. With dimensions of approximately 60 mm x 40 mm x 15 mm and a weight of 85 g, it maintains a compact form factor that seamlessly integrates into compatible camera bodies without adding significant bulk. The battery features built-in protection circuits against overcharging, deep discharge, and short circuits, ensuring safe operation and long-term reliability. Made from high-quality materials, it undergoes rigorous testing to meet Sigma's standards for durability and performance consistency. Specifically compatible with Sigma BF series cameras, this battery serves as essential equipment for photographers needing extra power while traveling, at events, or in situations with limited charging options. It maintains optimal performance in a temperature range of 0°C to 40°C during operation and -20°C to 60°C during storage. The battery is designed for approximately 500 charge cycles, retaining at least 80 percent of its original capacity, providing long-term value. For optimal performance, it is recommended to use Sigma's recommended charger and adhere to proper storage guidelines when not in use. This product offers a practical solution for extending camera operating time without compromising the quality and reliability expected from Sigma accessories.