Shop a wide selection of Laptop Batteries at Amazon.com. Free shipping and free returns on eligible items.. A battery is a hardware component that supplies power to a device, enabling that device to work without a power cord. Batteries are often capable of powering a laptop computer for several hours depending on how much power it requires..To determine the part number of your battery, simply shut your laptop down, unplug the power cord, and open the battery compartment. The information will be printed directly on the battery. Voltage, Shape, and Size. Double check your existing computer battery to ensure you’re purchasing a replacement that matches its voltage, shape, and size.. If your battery icon is not shown in the Windows Notification Area like the picture , select your version of Windows from the list below and follow the instructions. Note If these steps do not resolve your issue, it’s possible there is a group policy setting on the laptop preventing the battery.Buy Laptop Batteries from Laptops Direct the UKs number for Laptop Batteries. We have the biggest range in the UK and we also offer finance. Order online or call for free advice..If you are running Windows on a laptop or tablet your battery life is important. Besides using the live estimate in the notification area, we’re going to show you how to .