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BQ24072T: Parallel charging

Part Number: BQ24072T

Hi,

I would like to use the BQ24072T for charging my system. Hereby I have a question about parallel lithium batteries:

We want to connect two systems together.
The first system, is used for short distance. If necessary, the second system is linked to the first system. This ensures greater range.
Both systems have our own battery. When the two systems are linked to each other, the system can last longer. Because of the parallel lithium batteries.
It is possible that the two systems have different battery voltage, because one system is used more often than the other.

How can I avoid that the higher-voltage batteries overpowering the lower-voltage batteries. When the Lithium batteries voltage are not equal?

Kind Regards,

Yaaser