Well it will obviously drain the battery, as e-ink displays only consume electricity on refresh. the 'ink' is either black or white, and changing the state is w

Well it will obviously drain the battery, as e-ink displays only consume electricity on refresh. the 'ink' is either black or white, and changing the state is what costs electricity. Once the state is changed, it doesn't consume any more electricity. So increasing refresh-rate when scrolling increases the amount of current needed to flow through the system, and will indeed drain battery life.