This is a brand new Dell KM958 battery for select Studio 15 models. This KM958 battery is compatible with the Dell Studio 15, 1535, 1536, 1537, 1555, 1557, and 1558 laptop models. It is also compatible with the original Dell KM958 battery part number.

We use the highest quality lithium-ion batteries that charge faster and last longer than cheaper, lower quality batteries. This KM958 battery is rated at 5200 mAh and will normally last 2.5 hours on a full charge. There are no compatibility issues if your existing battery is rated at 4400 or 4800 mAh or a lower Whr.

Laptop Battery Express is a US based business with knowledgeable support staff to assist you before and after the sale. Yes, we have a phone number and real people answer your call! Free technical support is available if you need additional help in diagnosing power problems with your battery, ac power adapter or battery meter software.

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.

You can expect about 2 hours to 2-1/2 hours of run time with this Dell KM958 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 Dell Laptop (our DELL-93XT).

This battery replaces the Dell Studio 15 1535 1536 1537 1555 1557 1558 series laptop batteries and additional machines which are listed at the extreme bottom of this web page.