STARTRC V2 Battery Constant Temperature Heating Bag For DJI Drone Battery (Black) Features 1. Strong versatility. The thermostatic bag has an integrated double-compartment design, which is suitable for most batteries, mainly for DJI drones and drone batteries. The double-compartment design can accommodate 2-3 drone batteries at a time; 2. High-quality materials. The outer material is made of waterproof film, which can prevent splashing, dirt and dust. The lining is made of EVA material and the middle is made of thermal insulation cotton. It has a certain buffering effect, reduces vibration, and has a certain protective function while keeping warm; 3. Constant temperature heating. It has a built-in heating function, and the external interface is a USB port. It can be heated by a power bank or a plug. Constant temperature heating keeps the battery within a tolerable heat range to prevent battery abnormalities due to overcooling; 4. Extreme cold protection. The thermostatic bag designed for extremely cold weather can be used for outdoor cold weather. It can be used with a power bank when going out to meet the outdoor flight needs in extremely cold weather. It can be carried with a bag for travel, which is simple and convenient; 5. Easy to carry. The constant temperature bag has a hand strap design on the top, which makes it easy to carry. The hook design on both sides can be used with a lanyard to reduce the burden of carrying. The overall size is small, which meets the needs of outdoor travel and travel, and is easy to carry. Specifications 1. Size: 160x105x245mm 2. Weight: 140g 3. Material: Oxford cloth 4. Packing list: Constant temperature heating bag x1, instruction manual x1