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SoonerAviator
Lets talk about those batteries as a canonical example. Say you've got a boat with a lead acid battery, and you need to replace it every 3 or 4 years. That battery costs something like $200. The airplane equivalent of that battery also needs replacing every 3 or 4 years. It costs $600, so roughly 3x the cost. And if you want to upgrade that battery in your boat, just make sure it fits in the box. The airplane guy needs an STC (many AMU's probably) and and A&P to install it. Its a small example but an instructive one.
Right, but you're replacing $600 worth of batteries in the boat because electric trolling motors are usually on a 36V bank. So, the cost is the same no matter whether it's marine or aviation. Sure, the certificated part is true in aviation, but if you buy that RV-7 instead of the PA28 you can put whatever battery you want in it. The costs are comparable.