My turn for battery probs....

[CatmanV2]

KY jelly do the trick in lieu of vaseline?

Not so much. In honesty you might well be OK if you loosen it, reseat it and tighten it and make damned sure it's fixed. nut a little extra attention wouldn't go amiss.

C

 

[Ebenezer]

Not sure he was talking about battery terminals.... so advice may need to be qualified.
Eb