I have had issues with my truch starting at different frequencys, this happend a couple times over last weekend, also I can see corrosin around the terminals and have had to fill with water. The dealership said they couldnt find any problem, but this shouldn't be happening with a 2 year old battery. I had some issues with this when the truck was new.
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2009 Ford F-150 Question: Battery issues, not starting, losing water
Answer #1torque wrench from Stewart's Auto Repair LLC, April 14, 2011, 19:27Master
Sounds like you are having a overcharge problem. May be intermittent, needs to be checked when cold, hot, and running a/c heat etc. The fact that you are getting corrosion around the terminals and having to add water, are sighs that battery is overcharging and boiling the water out.