I have a Explorer II which is 4 yrs old, bought it used and now its having issues. It started out by going crazy like high EMI but I shut it down took out battery and notice the battery pack was melting and very hot. So I put in the rechargeable one in and after that never wasnt the same. I did a hard reboot which did help some what but still not the same as Im use to. I replaced the coil thinking that was it, nope its not. I did notice that the ground balace is different and acts wierd and fades out. It still works ok but the processor is slow to pick up on smaller objects pennys and dimes,Qtrs or bigger just fine. Is there a number to call at Mine lab other than the one I got 1-877-767-6522 or 888-949-6522 it seems I can never reach them. Thanks Terry