How long does you battery last? I purchased a new Yaesu battery about 2.5 years ago. I drive the bike to work about 2-3 times a week (5 miles each way). So I didn't think I needed a battery tender. Last week the bike seemed to be straining to start. It started. I brought it home and put it on the tender for 48 hours. I don't really have a load tester. Any ideas on testing it?