BTExpert Battery for Dell Inspiron 3421 3437 3442 3443 3521 3531 3537 3541 3542 3543 3721 3737 5421 5437 5521 5537 5721 2600mah 4 Cell Color: Black| Dimension/mm : mm| Type: Lithium Ion| Capacity: 2600 mAh| N.W./g: | Unit Cell: 4| This Replacement battery is guaranteed to meet or exceed original specifications. Quality: Durable and Utilizes high quality grade "A" cells for higher performance and more reliability. Fast charging. Low power consumption. Built-in protection circuit ensures both safety and stability. Buy with confidence!: The most cost effective and long lasting product available on the market today. Peace of Mind - 30 day worry free/no question ask return policy. Fast Shipping Peace of Mind!: Freshly produced and environmentally friendly and certified merchandise. We don't keep these on shelf because of our high-volume sales. We are able to sell good quality products at low prices because we buy direct from Manufacturers & Distributors in bulk quantity. BTexpert is a registered trademark protected by the US Trademark Law and is marketed exclusively by BTEXPERT. Any attempt to copy, relist or resell of BTexpert products without permission is prohibited; we reserve the right to take action against violators.