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BQ40Z60EVM-578: Recommended fuel gauge for 4 lithium-ion batteries in series

Part Number: BQ40Z60EVM-578
Other Parts Discussed in Thread: BQ40Z60, BQ40Z50-R1

We are developing a portable medical device, powered by a pack of 4 lithium-ion batteries connected in series, and require an accurate estimate of the battery charge. The batteries are exposed to temperatures ranging from 20 to 37 degrees Celsius. We were thinking of the bq40z60, because it also offers battery monitoring and charging. Do you agree? Furthermore, how difficult is it to work with the bq40z60 and its evaluation board? For rapid prototyping, would you suggest a different fuel gauge that is easier to configure and handle? Thanks!