I've been having some problems starting my '07 Pilot. The battery is less than a year old. When I go to start it, it has a fast clicking sound and the lights blink but it doesn't have enough power to turn over. I am able to jump it (barely) with a portable jumper and it'll run fine after that (I've done 10-15 minute trips). If I start it up soon after, it'll start fine, but after it sits, I run into the same problem. I'm trickle charging the battery now. I've made sure the overhead lights are off and doors are tightly shut. Any ideas what it may be and other things I should check?