Rebellion88

Firstly using your laptop on the mains all the time will degrade your battery and they usually do naturally too. The only way i get my laptop to take every bit of charge in that it will possibly take is by setting the power scheme so it will run every bit of juice out of the battery. So turn every option down to 0% and leave it to go fully flat. Make sure all your work is saved in the process as this could result in data loss, but then leave your battery to charge fully and, even when it says its full, just disconnect and re-connect. Batteries have a memory so its best to let them go fully flat once in a while.