It's okay, you don't have to worry. All batteries sold in retail stores are designed to work with your laptop, so they are all compatible with each other. The batteries and the charger raise the battery to 10.8 volts, so you should be fine. Before replacing a 14.8 V battery with an 11.1 V battery, it's important to make sure that the vendor certifies that the battery won't harm the system and that it's designed to work without causing any system problems or damaging any of your hardware.
When you're looking to replace your laptop battery, you may be wondering if you can replace it with a higher-voltage one. For example, you can use four 1.5 V AA alkaline batteries in your digital camera, but you can't use two 1.5 V AA alkaline batteries in an electronic device that requires a 3 V lithium battery. Even if your laptop battery is working normally, it will eventually lose its capacity over time, so it's a good idea to replace it when you first notice any problems. The difference of 0.3 volts between laptops and their batteries is within tolerance limits, but if it makes you feel better, you can consult the Guide to adapter parameters for the use of laptop batteries with Surface Pro tablets, where Microsoft includes a graphic that shows the expected voltages for different brands of laptop batteries and also includes some data points on specific models. We'll be happy to help you find a replacement battery and we'll make sure it's compatible with your laptop. Replacing your laptop battery with a model that has a larger capacity isn't difficult, but there are some steps you should follow to ensure that everything goes smoothly. However, it may not be a good idea because some people have damaged their laptops after replacing the battery.