The SmallRig 5107 portable charging case is specifically designed for EN-EL15C camera batteries and provides a reliable charging solution for photographers on location. This compact charging case, made of durable ABS plastic with a matte black finish, measures approximately 15.5 cm in length, 8.5 cm in width, and 4.5 cm in height, weighing around 350 g. It holds two EN-EL15C batteries simultaneously and allows for sequential charging with clear LED indicators showing the charging status of each battery slot. The device operates with a USB-C input port that supports 5V/2A power supply and is compatible with most USB power banks, car chargers, and wall adapters. The charging time for a single depleted EN-EL15C battery is approximately 2.5 hours, with intelligent circuits providing overcharge protection, short circuit protection, and temperature monitoring during operation. The case features a built-in LCD display that shows real-time battery status for each slot, as well as voltage and charging current information. It supports charging temperatures from 0°C to 40°C and storage temperatures from -20°C to 60°C. The portable design includes a non-slip rubber base and a carrying strap for easy transport in camera bags. This charging case is exclusively compatible with EN-EL15C batteries used in various Nikon DSLR and mirrorless cameras, offering a practical alternative to standard wall chargers for photographers who require multiple battery swaps during extended shooting sessions. The device meets CE and RoHS certification standards for electrical safety and environmental compliance.