This is a brand new Dell MT277 battery for the Studio 15. This Dell MT277 battery contains the very best Li-ion cells on the market from Samsung. This MT277 battery is rated at 5200 mAh or 58 Whr. This is the highest rating available for a 6 cell battery pack. The higher the mAh rating, the longer your battery will run before it needs to be recharged again. There are no compatibility issues if your existing battery is rated at 4400 or 4800 mAh or a lower Whr.

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.

You can expect about 2 hours to 2-1/2 hours of run time with this MT277 battery when new, depending on your energy use. If you are looking for even longer battery run times, check out our DELL-93XT. This MT277 battery replaces the Dell Studio 15 1535 1536 1537 1555 1557 1558 series.