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It would not hurt to leave the battery pack in the e-trac for a short time. (a few days) I think it's a good habit to take the battery pack out if you are not going to use it soon. You never know when batteries ( AA or rechargeable batteries) might leak and damage the detector.
Don't use any other battery charger, only use the one that came from Minelab. Because the battery pack is enclosed in a closed plastic case, it will over heat and damage the pack if you used a higher amp charger.
If you look at the charger from Minelab you will see it chargers at 15V DC @ 100 MA. This a trickle charging system. (slow) this way the pack will not over heat. There is also a small circuit card in the pack the works Minelab charger. You should not have any memory problems with the pack because it Ni-Mh batteries in it, and they don't have memory problems.
I'm with Bart. I charge mine after every hunt, which equates to about 2 or 3 times a week. I charge them overnight and unplug them in the morning. Sometimes, I forget to unplug them, but as Bart said, it will not hurt them to keep'em plugged in.