Dell Inspiron 8500 8600 500m 600m Latitude D500 D510 D520 D531N D600 D610 D620 D630 D630N D800 D810 D820 D830 D830N Precision M20 M60 M65 M2300 M4300 Replacement Battery, Compatible part number: 312-0102, 312-0085, 4R084, 5P171, 0M787, 7P806, 9X001, 312-0069, 312-0122, 310-4345, 310-9124. The Dell Secondary Media Bay Battery can be used in the modular bay to extend your Laptop's battery life over the single battery configuration. The 6 cell Lithium-Ion battery has a longer life than a conventional battery and does not require replacement as often. There is no battery memory effect with a Lithium-Ion battery, you can charge the battery whenever... More you like without fear of reducing its charge capacity. Moreover, you do not need to drain a lithium-ion battery completely before recharging it. This product has been tested and validated on Dell systems.This product comes with 1 year limited warranty.