The maintenance process is dependent on what type of weed eater you have got. For all weed eaters, it is essential to replace the spool frequently. For a gas-powered model, it is advised to check the spark plug and air filter from time to time. Checking the oil levels is advised as well. For battery-powered weed eaters, the most important part of maintenance is keeping the model clean and attending to the battery. The electric weed eaters are the easiest to maintain as all you need to do is check the cord for any damage and ensure that the weed eater is kept clean. Easy!