Righto so the general consensus is, use tape heatshrink or Phase Techs batteries put the cap on square or stretch the springs. All the above work and everyone's happy problem solved.
I hope someone at Minelab reads this topic it might give them a few trouble shooting tips to include in their owners manual should they choose to do a version 2, doubt it though. The machine should never have been released for sale until this problem was resolved imo. I haven't raised it with them and couldn't be bothered to be honest. Pretty sure I'd only receive a heap of spin doctoring. Would have come up during field testing you'd think just the commercial age we live in.