If your Dell Inspiron laptop isn't holding a charge, this M5Y1K replacement battery can bring it back to life. It's compatible with Inspiron 15 5000 and 3000 series models like the 3451, 3551, 5558, 5559, and 5555 (also fits K185W and WKRJ2 models). The battery is a 4-cell Li-ion pack with 14.8V and 2200mAh capacity – matches the original specs. Brand new, unbranded but built to fit and function perfectly. Comes with a Prop 65 warning for chemicals, so handle and recycle responsibly. Easy to install – just pop out the old battery and snap in this one. Get your laptop off the cord and back on the go. A cost-effective fix that beats buying a new computer.