Key Purchase Considerations
- “With IC” vs. “Without IC”: Opt for a board variant labeled “With IC”. Budget replacement boards without the proper integrated circuit often disable 18W fast charging and ruin microphone clarity.
- Exact Model Match: Verify your device settings read model KM4K to prevent buying parts meant for the base Spark 40 or Spark 40 Pro.
- Installation Advice: Unsnap the battery flex cable before swapping out the charging dock to prevent accidental short circuits.





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