Decoding Battery Ratings: Amp Hours vs. Watt Hours > 자유게시판

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When shopping for batteries—whether for a power tool—you’ll frequently encounter two critical metrics: amp hours and energy capacity. These values indicate how much energy a battery can hold, but they measure fundamentally different things—and understanding the difference can significantly improve your decision-making.

Amp hours, or Ah, quantify the total charge output a battery can supply over time. For instance, a 12 Ah battery can deliver 0.5 amps for 20 hours. This metric gives you a rough idea of how long the battery will last—but it ignores potential energy. A 12 volt 10 amp hour and a 36-volt battery with 10Ah are rated the same in Ah but differ significantly in total capacity.

Watt hours, or Wh, measure total usable energy. It’s calculated by using the formula Wh = V × Ah. So, a 12V 10Ah battery equals 120 Wh, while a 36V 10Ah battery equals 360 Wh. This means the second battery holds considerably more energy. Watt hours provide a direct comparison of how much work a battery can perform—no matter the design.

Why does this matter? When evaluating power sources, always prioritize Wh if you want to know which delivers more power. Two batteries with matching current capacity but varying electrical pressure will function unequally. For example, a 20 amp hour 12 volt battery and a 10 amp hour 24 volt battery both provide the same total energy, making them interchangeable in output despite their disparate current ratings.

Some manufacturers emphasize Ah values because the figures look more impressive, یو پی اس but watt hours are the accurate metric for real-world usage. Always check the voltage rating to calculate the watt hours if it’s not listed. Trusted companies list both metrics, but if they don’t, you can do the math by using V × Ah.

In summary, amp hours describe electrical throughput, while Wh reveal actual stored power. For fair evaluations, always rely on Wh. Whether you’re selecting a battery for your gadget, understanding this distinction helps you avoid misleading specs and maximize runtime.