You may also want to check out the website www.Piloteers.org. The Ridgeline and Pilot are quite closely related, but there may be a similar experience there and by the 2010 MY, the sales of the 2010 Pilot was approximately 102k, whereas the 2010 Ridgeline sales were approximately 16k.
Now the fact that you have an 2010, which most likely has a battery manufactured in '09, I'm with Dnick, replace it and keep doing whatever you've been doing, that's about 7 years on 1 Battery, I've replaced them almost every 2 1/2 years since I bought my RL in June '05.
I'd also check the transmission dipstick, and confirm the ATF is red, not pink, or foamy, in addition to the coolant should be blue, then if you DIY at all, check the front 3 spark plugs, are tight and have no oil or other residue on them.
Now the fact that you have an 2010, which most likely has a battery manufactured in '09, I'm with Dnick, replace it and keep doing whatever you've been doing, that's about 7 years on 1 Battery, I've replaced them almost every 2 1/2 years since I bought my RL in June '05.
I'd also check the transmission dipstick, and confirm the ATF is red, not pink, or foamy, in addition to the coolant should be blue, then if you DIY at all, check the front 3 spark plugs, are tight and have no oil or other residue on them.
