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BQ40Z50-R2: Firmware version checked

Part Number: BQ40Z50-R2
Other Parts Discussed in Thread: BQ40Z50

Hello Sir:

Our end product is a power tool, our operation temperature range is -20degree to 60degree.

And we found the BQ40z50 FW version has R1, R2, R3, R4, and R5.

Would you please recommend a firmware version for us? we need to know which version is suitable for our application.(especially low temp)

Looking forward your feedback.

Thanks a lot.