The product is a 36V 30000mAh rechargeable Li-lon battery pack by MKEPA. This battery pack has a high capacity of 30Ah, providing long-lasting power for various consumer electronics devices. Made in China, this rechargeable battery pack is versatile and perfect for use in a wide range of applications. With a free return policy, customers can purchase this battery with confidence, knowing they can return it if they are not satisfied.