Hi All. My mom purchased a pack of double A rechargeable 2500 mAh batteries with a charger for my quattro. I don't have the rechargeable battery pack so I know I'll have to open up the battery pack and take them out to charge them, but my biggest concern was if their safe to use in the Quattro? I wrote to a Minelab Rep. about them and they told me to "not" use them, and I was told not to use rechargeable batteries higher than 2100 mAh as the 2500's could ruin my machine. Has anyone else heard about this, or am I safe using the 2500's? Thank-you. Sincerely, Randy