A: Hi Gail, you must charge the battery before first use. Allow the battery to charge for 12 hours upon initial use. CHARGE TIME: First use-12 hours; thereafter, 1 to 6 hours depending on the battery). When you charge the new battery or one which has not been used for long periods of time, it may not reach full charge until after you have discharged it fully and recharged it several times. The battery will only accept 60% charge upon initial use and after prolonged storage. This means that you may experience decreased run time. However, after several charge and discharge cycles the battery will accept a 100% charge and you will notice that increased run time as a result. The battery charger supplied was designed to charge the lithium battery also supplied. DO NOT USE ANOTHER BATTERY CHARGER. Runtimes may vary however you can receive up to an hour per charge. We recommend purchasing an additional battery to assist with tackling larger tasks. We have a high capacity 20V 4.0Ah lithium battery that will increase your runtime with twice the amp hours of our standard battery. WORX also offers 60 min quick charges to get back to the job at hand faster. Should you have any additional questions or concerns, please contact our Solution Center Team at 866-354-9679 Monday through Friday from 9 am until 6 pm EST. We'd be more than happy to assist you. Thank you for choosing WORX! - Heaven J

A: Hi Jack W, yes the 4.0 Ah battery is compatible with the WG17.2 trimmer. Thank you! -Heaven

A: Hello Valued Customer. The Worx WG170.2 12" - 20V GT REVOLUTION Grass Trimmer comes with three spools. The line is pre-wound on spools specially designed to work on Worx the WG170.2 12" - 20V GT REVOLUTION Grass Trimmer / In-Line Edger / Mini Mower with Command Feed. You may, however, use a different brand line and reuse the spools. Be sure to use a line that is approximately 0.065” - Heaven