WE PURCHASED 3 UNITS, SO FAR WE HAD TO RETURN ONE BECAUSE IT WON'T HOLD A CHARGE ANY LONGER THAN 4 HRS AND WE NEED IT TO WORK A FULL DAY, THE OTHER 2 SEEM TO BE WORKING FINE I WILL SAY THAT THE RETURN PROCESS HAS BEEN SMOOTH THUS FAR AND I AM IN HOPES THAT WE WILL RECEIVE A PROMPT REFUND UPON RECEIPT OF OUR RETURN