I ordered a replacement battery for my Asus laptop which was relatively easy (by model number); the installation of Asus laptops requires disassembly of the case, but this too was relatively easy... I had bought s laptop and phone tool for this. It took about 30 minutes to carefully unscrew the case, remove the old dead battery and install the new one. The laptop immediately recognised the battery and powered to life... Very happy with my purchase... I highly recommend Laptop-Battery.org.uk and will definitely use them again!