If the old charger has a deep-uncharge-protection contact and was also made for Li-ION ther is in any case a marketing technical design by a notch to protect the battery to place on the charger if this cells are not correct. (this answer applies to all brands with a quality mark)
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If the old charger has a deep-uncharge-protection contact and was also made for Li-ION ther is in any case a marketing technical design by a notch to protect the battery to place on the charger if this cells are not correct.
(this answer applies to all brands with a quality mark)