I cut about five cords a season for fuel and I would not use an electric sharpener so I cant help you. Electric sharpeners waste a lot of chain. you also need to file down the guides as you go. If you do not overheat and quench a chain it will sharpen quite easily, it will stay sharp a long time if you dont hit the ground and take extra effort to knock off dirt filled bark , theres a lot of dirt in some tree bark next to roads especially
You file by hand ?