This is a brand new Dell Inspiron 640m replacement battery. There are two things you need to look for when buying a new computer battery: the quality of the lithium-ion power cells inside the battery cartridge, and the quality of the computer chip in the battery pack. All of our batteries come with the highest quality components, not the cheapest. This battery contains the very best Li-ion cells on the market from Samsung.

All our products carry a full 2 Year warranty and every battery is charged and tested before it ships. We provide a 30 day money back guarantee if you are not completely satisfied. We are so confident in the quality of our batteries, we will pay for any and all shipping expenses if our product fails to perform in the first 30 days you have our battery, even if it is not our fault.

You can expect about 4 -5 hours of run time with this Dell Inspiron 640m battery when new, depending on your energy use. If you are looking for even longer battery run times, check out our extended run battery for your HP laptop (our DELL-640mXT).