Not too long ago I needed an extra rechargeable battery pack that would fit the XS Sovereign.After calling a half dozen of Minelab dealers and talking to the lady at Minelab I found a rechargeable pack from the Nevada distributer.The gentlemen I talked to explained he had one battery pack left and that It was laying around for a while and didn't know if it would take or hold a charge the cost 34.00.I was aware of the possible problem and bought the rechargeable battery pack.The battery pack worked for a couple of hours after charging,and finally wouldn't even hold enough charge to fire the XS up.I only had one rechargeable pack left and it was ancient.My original solution solder ten rechargeable AA batteries in the same series salvage the plug from the original pack and I'm back in business.But wait? I thought its worth a try.I went to Meijers and bought a 8 pack of AA batteries rechargeable batteries for twenty dollars and placed these in an extra Minelab alkaline pack.I plugged the pigtail into the Minelab charger and charged the new batteries before using as described in the directions.Since using these batteries I have logged in 11 hour with no problems.I hope this helps someone with an XS looking for a replacement for their rechargeable battery pack.