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BQ25171-Q1: Query Regarding Necessity of BQ76905 Battery Balancer in BQ25171-Q1 Design with Two 18650 Lithium-Ion Batteries in Series

Part Number: BQ25171-Q1
Other Parts Discussed in Thread: BQ76905,

I'm attempting to utilize the BQ25171-Q1. I intend to connect two 18650 lithium-ion batteries in series. Depending on the operational scenario, my design draws up to 1A from the battery, with a typical operating scenario being around 100mA. Is the BQ76905 BATTERY BALANCER necessary for my design? While I acknowledge that having it would be beneficial, I'm interested in understanding whether it is indispensable and the level of necessity.

Regards JH Park

  • Hi JH Park

    Recommend checking with the battery cell manufacture on necessity of cell balancing circuit.  This will depend a lot on the cell, operating condition and load.

    As a general rule we do not see cell balancing used on two cell configurations.