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BQ24157: BQ24157 REG06 reset problem

Part Number: BQ24157

Hi Sir,

    Would you like to tell me, in what circumstances,REG06 are reset  to default values?

    I have a client, do the following tests:

   The highest voltage of 4.5 V batteries, after  charge done, don't pull out the adapter, more than 12 hours after charging for a long time,
Found that the battery down to around 90% .

    Found at this time,REG06 are reset  to default values that the max charger voltage is 4.2V.

    Is this normal?   Do you have any Suggestions to solve this problem?