Will the new NiZN rechargeable AA batteries damage my detectors?? I will be using them in my Minelab Explorer XS, my Garrett GTI1500 and my Garrett Sea Hunter Mark 2. I have read only good remarks about the NiZN's but I read they will total 13.0 volts when fully charged and I certainly don't want to ruin any of my MDs. THANKS for the advice!!