Hello McPostersons! Anyhoo, with the arrival of 100-degree weather in central Texas, my Prius is not doing very well. First, some background info: - Over the past year or so the battery capacity hasn't been that great. If I floor the car for over 15 seconds or so, the battery charge goes down to 25% or 33% or whatever, from a fulll 66% or 75%. - I got the red triangle last twice last winter during cold-morning starts. Both times it went away pretty quickly, I would merely pull it over and restart the car to force the ICE to try again. (Toyota dealership said the code was that the engine wouldn't start. They wanted to replace a relay, and I declined). - The "Check Engine" light came on for awhile over the winter too. The dealership wanted to replace the catalytic converter for $2100. I declined. The light went away on its own. - Fuel economy dropped, I could easily get over 50 MPG before, now I'm stuck in the mid-40s. This is probably slightly related to a change in driving habits, but not completely. Now to the NEW stuff: - I have noticed some hesitation in acceleration when first starting the car over the past few weeks. After a few minutes, acceleration returns to normal. - About two weeks ago I saw the "Turtle" light for the first time. The battery had a good 2/3 or 3/4 charge. It was extremely hot/humid at this moment and the fan battery in the trunk was running at full tilt. The turtle light went off again after the temperature dropped a little. (Note that now I know what the turtle light really means. It doesn't mean drive slowly, it means that you won't be able to accelerate quickly, so don't even think about pulling in front of someone like you might do normally). - This morning, the red triangle reappeared with some extremely noticeable problems with accelerating from a stop. It's almost like the brakes are stuck a bit, with a full throttle needed to release them. The engine comes on and runs. The A/C will run at its normal clip for awhile, then still blow cold air but at about half power. It is around 100 today with rather high humidity again. The battery fan in the trunk is again blowing noticeably. Would anyone like to make a wager as to what's going on? Is my Prius on its last legs?