I bought a replacement battery from GreenTec in Fall of 2012. Using GreenTec's video, I was able to replace it myself fairly easily. Unfortunately, by Summer of 2013, it was failing - unable to hold a charge - turning on warning lights - and sometimes shutting down. GreenTec honored my warranty - and then some ... This Fall, they personally delivered another battery to my house and replaced it for me. Over 500 miles on this battery and running fine.
Dave Danenberg
Glastonbury, CT