I have a Ni/Mh-Nicad battery charger for AA and AAA cells. It will charge from one to 4 cells and has a Duracell brand on it. MOdel CEF80NC. The far left cell LED stays on RED, even with the cell removed. I opened it up and found four of the RU52 devices inside and the on associated with the bad position has been hot enough to mark and discolor the cover. I removed it and it is an 8 lead device with pins 5 and 6 tied together and 7 and 8 tied together. Here is a picture of it. It is about 0.2" long. Not only, what is it, but where might I find a replacement?