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BQ25890: Charge for two battery

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Part Number: BQ25890

Our smart phone have two battery, main battery and the secondary battery.

Normally, the main battery are used for system power. 

If the main battery is pulled out, it can be switched to the secondary battery as one as possible to ensure Vsys drop down.

when charging,main battery and the secondary battery did not charge each other.

How to achieve it ?

Thanks


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