First things first - Thank you Jason for creating such a worthwhile website!! I'm very impressed with its design and with the wealth of information it provides! The intelligent questions and equally intelligent answers from many of your participants sets this forum apart as one of the best I have found.

Now for my question. With long down hill coasts energizing the regenerative braking and charging the traction battery, is it possible to overcharge the battery? If the battery begins overcharging, heat will be created in the battery which could lead to its early demise. Knowing Toyota's penchant for perfecting every last design detail, I doubt this would happen, but I'd like to hear from someone who has had experience with long, continuous down hill coasting in the 2004 Prius.

Also, does the battery charge much on long, steep uphill drives?