I just need to correct you on this. Our brains are not implanted or exposed in any way. It does not take a lot of trauma to get our stuff mapped. It's just like going in an audiologist office and tweak some of the sounds. The first year and second year it takes a bit of mapping, but after a while, we rarely need to get new maps unless if something sounds too soft or whatever.
What other "electrical devices"? Hearing aids have batteries, so do CI. Hearing aids have T-Coil, so does CI. Hearing aids can use the T-Loop/FM system/headphones. So does CI.
I know you don't have CI, but it would be nice to educate yourself regardless. Again, our brains are not implanted. It's our cochlea, and we do not have a "hole" in our heads.