I need a new string trimmer ASAP. I had a Yard Machines 4-cycle string trimmer that lasted 14 years, but needed $90 worth of parts to repair it myself when it broke so I threw it away. Some of the lithium-ion rechargeable trimmers look interesting. But you can buy a lot of gas and oil for what a replacement battery cost. I'm also wondering how many years a lithium-ion battery would last? Would getting 10 plus years out of a battery be realistic?