This is a large capacity portable battery. It can be charged using 220v. Compared to the existing auxiliary battery, the storage capacity is 3 to 4 times larger. It can cover 30000~50000mAh by using a cylindrical battery cell inside. This battery is very suitable for outdoor activities. Due to its large capacity, it can also be used for 2 days and 1 night travel. I thought about the large capacity and usage environment of this battery. And in addition to the battery's original function, we added a lantern and a Bluetooth speaker function. In outdoor activities, especially camping, these two products are always needed.