Sounds like you got a good food system. About the freezing meats, I recommend checking out the "instant pot" or another brand of electric pressure cooker. Frozen chicken is a go to for me (I buy it frozen). I throw some chicken in the pot, let it cook for 10 or less minutes under pressure and its cooked. Very hands off, and maybe takes 20 minutes in total because it has to pressurize. I've never done other frozen meats though but I assume they have similar results.
Yeah you have a good point about interstate specializing in batteries. And the 12 month warranty makes me feel better. I'm sure 12 months from now I won't feel like I spent so much money on them.