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by criddell 794 days ago
You should definitely replace all of the cells at once, even if you are just using drugstore batteries. If you don't they are not going to last very long.

Manufacturers are not being as careful as you are. They bundle batteries from the same manufacturing batch with no testing and rely on battery monitor and balancing ICs.

https://www.ti.com/battery-management/monitors-balancers/ove...