Yup, short trips and warm climate = battery killer.My Accord has been slow to start for the past 3 days. The last 2 times this happened the battery quit a day or so after these symptoms showed up. I purchase the Everstart Maxx batteries from Walmart for my Accord. The first lasted 2 years which was replaced for free under warranty from WM, the second lasted 2 years which was replaced today (prorated). So this is my third battery in a matter of 4 or so years. This battery has the full 3 year warranty. With any luck it will fail before 3 years and I'll get another free one. I attribute it to my short trips. So far I have put under 1700 miles on the car since January. We live very close to work.
I guess you could do one of two things, replace every 2 years since its free to do or replace every 4-5 years by constantly putting a maintenance charger on it. Your vehicle is considered severe use due to the low mileage.