Has anyone had this problem? My rechargeable batteries won't power up my Explorer II. The AA batteries work with the unit but the rechargeable won't. I bought a new rechargeable figuring it was the battery pack and that didn't work so I thought it must be the charger so I bought a new charger. New charger, old charger, new rechargeable battery, old rechargeable battery, no combination works. Any6 ideas what this problem may be?? Thanks