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"Stronger" isn't a good word here.

Given the most common D and 9V batteries, it's more a question of "different" than "stronger".

The 9V has a higher voltage, while the D cell has a bigger capacity. What'll be best depends on what you need. It's like trying to decide if a sports car is better than a tractor.

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10y ago
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13y ago

Depends on how you measure it. A 9V battery is nine volts, while a AA is 1.5 volts, but they probably have approximately the same total power.

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Q: Is a double a battery stronger than a 9v battery?
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