The DataSafe DX 4DX-19B are equipped with four wet cells for unparalleled efficiency. The DX series was created for data centers and other high-rate USB applications. They are reliable enough to trust with the job, and are affordable as well. These batteries have been customer favorites for over 20 years now, and for good reason. The DX 4DX-19B has a patented Slide-Lock post seal, optimal grid, and dual lug design. The heavy duty plate lug and strap come standard, as does the PVC flame-resistant case. This battery is rated at 100% capacity during the initial discharge.