The K3 will have 4G of memory and a battery that lasts a month if you don't use whispernet all that often. The replacable battery is not available. It is not a feature that is important to me. My K1 has its original battery and is doing fine. I have not read reports of K2's needing to have the battery replaced.
I have not had a K2 so I cannot comment on the zooming capability.
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