Hi, we just changed batteries in one of our APC Smartcell XR's and while the Matrix 5000 recognized it ok after we connected and reset it and says 2 battery packs installed and 0 bad packs, the led on the smartcell itself had been blinking for about 36 hours. Actually, both of our smartcells led's are blinking, even the one that we didn't change batteries. I was thinking that it was indicating that it was charging but it seems to be taking too long. Although we do have a big load, 77% on it, so maybe? I can't seem to find any help on what this means. I ran the battery tests fromt he Matrix 5000 and all are good. Thanks, Joe