Here's why:
* Different battery chemistries: Duracell and Energizer batteries can use different types of rechargeable batteries (e.g., NiMH, NiCd, Li-ion). A charger designed for one type might not be compatible with the other.
* Voltage and charging parameters: Even if the battery types are the same, the specific charging voltages and currents required can vary between brands. Using an incompatible charger could damage the battery or create a safety hazard.
* Safety risks: Charging batteries with the wrong charger could lead to overheating, leaking, or even explosion.
It's always best to use a charger specifically designed for the type and brand of battery you have.
Always refer to the manufacturer's instructions for both the batteries and the charger. They will provide the safest and most effective charging methods.