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[FAQ] BQ24196: how to calculate the total charging time for a 2000mAh battery

Part Number: BQ24196

How to quantitatively calculate the total charging time for a 2000mAh battery.

Especially, how to figure out the battery SOC of the turning point from CC mode to CV mode.

What's more, how to calculate the charging time in CV mode.

Calculation condition.

a. battery regulation voltage is 4.25V.

b. fast charging current is 2.5A.

c. charging termination current is 250mA.

  • Hello Shubiao,

    Inherently, the charger doesn't calculate state of charge. In order to calculate accuracte SoC, various inputs can be fed into a gauging algorithm such as battery voltage, current (coulomb counting) and temperature; the charger doesn't perform this algorithm. We do have single-cell gas gauges that perform SoC and run-time calculation using these inputs; in particular, for calculating charge time in CV mode, you would need to keep track of the current flowing into the battery (voltage based gauging will be hard during CV phase). I recommend starting by reviewing a gauge such as the bq27542 or bq27426.

  • In reply to Fernando Lopez Dominguez:

    Hi Fernando ,

    Thanks for you comments.
    What i want to know is a method to calculate total charging time.
    In another word, i need a guidance to select proper chargers ( or configure the charge current and battery regulation voltage )for different capacity batteries to satisfy the charging time demand.
  • In reply to Shubiao Wang:

    Closing thread since it has been addressed offline.
  • In reply to Fernando Lopez Dominguez:

    Thanks again

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