I hate to say, but looked though most of my Sovereign stuff and didnt come up with anything good. I must have given what I had to someone just like the extra rechargeable battery I had.
I checked with Amazon and they do have the battery holder that is 2 pack with 4 alkaline battery in each one. without the clip that connect the 2 battery pack it wont work. Now with the 2 battery pack that has 2 snap on connector (like 9 volt batteries) they can be connected, but then it would have to do some wiring like I was doing to those I switch over to the plug in battery instead of the one that the battery door hold the battery to make contact. Run into too many the cover would come lose and the battery would not make a good connection . I also see where the control box has to come apart and change the wire that goes to the built in plate in the battery compartment and slice in a wire with the connectors from the 2 alkaline packs as it needs 12 volts to work and rechargeable batteries may not work for you as 8 of the only put out 9.6 volts as they are only 1.2 volts each where alkaline are 1.5 volts. The rechargeable factory one had 10 cell in them.
Second option is they make rechargeable pack for the Sovereign XS, but this is also a plug in pack , so the wire will still have to be changes to use them. When I was doing them they were nickle metal hydride and a full 12 volts, but the one now are lithium and the pack puts out 11.1 volts, but last longer. I think it would work as its close to the recommend 12 volts.
if your friend just want to get it running in-order to sell it than the 2 holder with the connectors from Amazon and changing to the wire is probably the least expensive at around $20 buck or so if someone close to you can do the wiring for you as it is just a little soldering , or sell it the way it is.
What I am wondering is if he used to use it and know it does work OK once a battery pack is made for it. That this was not bought this way from some one that tried to set some thing internally, or think they can tweek it to be better as some tried this as some people were doing this to only make it worst. Then they sold them on the actions as I bought a few and had to get them back to factory setting before I was able to sell them again.
As you say he wants to sell it and would like to know if it works, if not some may have one and needs some parts. If we know it works as it should there are some like me that love the Sovereigns, might be interested my self if the price is right and depends what all come with it.
Rick
