Replaced my battery tonight. Last night I replaced the terminals with some brass ones I had laying around.
Saturday I went down to Little Sahara (Utah) and ran around in the dunes with a bunch of other offroaders from Rocky Mountain Extreme 4x4. Had a lot of fun, and managed to not break anything even though I tried pretty hard.
Well, except my battery apparently. Halfway through the outing I started having trouble starting the H3 back up, it'd end up just clicking the solenoid and not actually turning the starter motor. Fortunately after a bit each time it would eventually start.
The battery has been feeling like it was starting to wear out, this past winter it'd turn the motor over a bit sluggishly if it sat for more than a day without being run.
I think bouncing around caused it to finally go over the edge. I checked the voltage and while it would read 12.6 at resting, as soon as I turned the key to "On" it'd drop below 12 volts. When I pulled it tonight to replace it I noticed the sides were bulging which is a pretty good sign the battery is damaged. I wanted to get an X2Power AGM from Batteries Plus Bulbs, but it wasn't in the budget, so I ended up getting a Duracell AGM from Sam's Club for $130. It's not the best, but it's not bad either, it's a Deka/East Penn private label apparently which have good reviews, and has a 3 year warranty on it. It'll do for now.