I was getting the dreaded early low battery warning, at about 45% under load only. Hovering it was fine, but as soon as I moved, it would low alarm. My dealer All e RC in Mesa AZ asked me to send it in, they would test it and replace it if it proved faulty. So I sent it to them, and next thing I know I get an email with a tracking number. Brand new battery, with the square contacts. Mission accomplished. I have 2 other batteries that are so far so good.