Hi
Ummm ..... errrr ..... yes this *is* being picky. Sorry about that
In electronics / electricity resistance is something that obeys ohms law. A lot of what goes on in a battery is not strictly speaking a resistance ... (yes there are a few things that are).
Why does that matter? Well if it's just an ohms law thing then all you need to do is ramp up the voltage some more. That's not what works with batteries because not all of what's going on is an ohmic ( = a resistance) sort of thing.
Bob