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BQ40Z50: Charge and discharge voltage jump

Part Number: BQ40Z50

Dears:

    My customer use BQ40Z50 as battery manager for 4-cell lithium battery. We found there have a problem that charge and discharge voltage have jumped sometimes, it is different with actual voltage. you can see the data from the picture as below, is it a normal phenomenon? or there have solution can avoid this? thanks!