ok, seems a long time away.
Its been a strange year for detecting, only just getting back onto (the deserted) beaches where I am.
I was doing so well first part of year before everything shut.
I use a CTX3030 and excal II with Nel coil on.
No lubricant should be used on the battery seal. Even silicone grease will degrade the seal after 6 months.
The new batteries with rubber edging work great.
Just ensure there is no sand/grit in the grove before reinserting battery.
The ctx gets most gold chains, the really thin ones not but the EQ needs to be right on top of it and the chain needs to be on surface, even then the EQ signal is weak.