Cleaning battery contacts

Try a q-tip.
 
WD-40 makes a CONTACT CLEANER, black-yellow can, it is safe to use on plastic, so won't hurt anything, I give mine a spray once a week. The spray evaporates instantly, with no residue. There are other brands, just MAKE SURE it is PLASTIC SAFE! Couple quick squirts, and done!

Take care, Fly safe.
J Dot
 
Heck, the stick of the q-tip is way too big, let alone the stick with cotton on the end.
Ah, the rectangle slots. Just spray them with something like DeoxIT.
 
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