There are at least a couple of websites online where you can look up various parts of a Honda, and they sell at a discount. Doing this for the battery pack for a Civic Hybrid, the pack now costs a little over $1700, discounted. (I looked again to day, and couldn't find it again - the battery pack was no longer in the price list). That's lot's better than the $3K+ that people like to quote for the cost. I'm not sure if the Accord pack is bigger than the Civic pack (which consists of 120 "D" cell NiMH batteries in series, 1.2V each, 144 volts total, for comparison). I've also searched the internet for retail prices on NiMH batteries and found some for $5 each. They aren't necessarily the same as the car batteries (charge/discharge characteristics same?), but that would be $600 for 120, as a "do it yourself" option. (I wouldn't recommend it without knowing exactly what you are doing and knowing the batteries are correct).