Our toy is getting ready to get laid up for the winter so it's been on the trickle charger a lot these days. Seems like the trickle charger is on constantly; Had it on the road at highway speeds for 40 miles figuring that should bring it up to full charge but when I plugged it in at home when I returned the light on the charger came on and is still on 2 hours later. The battery is five years old and I'm wondering if it's starting to fail to hold a charge; the car started with out laboring and no idiot lights when I had it out, FWIW. Can anyone recommend an inexpensive battery tester to determine the condition of the battery? thanks for any help with this.