The best way to test if the battery is good enough is to charge it up completely and then immediatly do a battery load test. If during the load test it goes below 9.5 volts or does not recover to around 12 volts after the load test, junk the battery. If your battery in your car is the original 07 battery, it already has 3 years of use. You may want to just replace in now, anyway. From reading thousands of blogs from Honda Fit users, this battery does not stand up to the test of time. By the way, if you don’t have a battery load tester, or can’t get a dealer to test the battery for free, Harbor Freight, has them on sale, often, for about $15.