thats pretty low wear. on a bosch system. on my commutes with and without groceries I would get 2000 to 2500 hundred miles on a chain using a dry lube I would lose 500 miles in the winter rains. but I also got 12,000 on the drive train before the chain ring started jamming. I think the cassette may have handled one more chain but I had all the parts so I changed everything out. You should not be seeing battery range loss. I would just let the battery fully charge unless your going weeks between rides. I have only seen a small loss on mine after 14,000 miles and expect a lot more miles on it.