I have been using a Tracker IV Bounty hunter that uses 2 9volt Alkaline Batteries. Lately I have found myself abusing my bank account buying pack after pack of 9 volts at 8 dollars a whack. I am thinking about purchasing 2 rechargeable 9 volts to be used over and over again and over the long haul save some money. The situation is, rechargeable are not Alkaline. Does this make a difference? Is it OK to use the rechargeable in a Tracker IV? or will this be just more unnecessary abuse to my checking?