RND Li-Ion Battery (BL-4J) for Nokia Lumia 620 Perfect replacement or secondary battery made specifically for your Nokia Smartphone. RND Power Solutions batteries are fresh. Replaces: BL-4J RND Power Solutions products comes in professional retail packaging and offers a 1 year hassle free warranty. 100% Customer Satisfaction is our Goal. PLEASE BE CAREFUL when buying products on Amazon and only buy from trusted sellers. Sellers without authorization may sell an inferior quality product carrying no branding. Examples of some trusted sellers would be RND Power Solutions and Amazon. Authentic RND Power Solutions products will have our branding on the product and packaging.