What does the difference in Ah levels mean between the Yuasa NP7-12 and the NP4-12?

The NP7-12 and the NP4-12 are both 12 Volt Sealed Lead-Acid batteries commonly used as a backup power supply for alarm control panels, like the Vista Series Panels.

The main difference between the two batteries has to do with their respective Ah capacities, which also is reflected by their size. Ah refers to the amount of constant current the batteries can draw over a 20 hour period before dying. In the case of the NP7-12, it has a 7Ah draw. This means the battery can draw 0.35 amps constantly for 20 hours before dying (or 7 amps in one hour). The NP4-12 battery has a 4Ah draw, meaning it can draw 0.2 amps/20 hours, or 4 amps in one hour before dying.

This capacity differential also accounts for the difference in size and weight of the two batteries. The NP7-12 is heavier (at 2.65kg) and has larger dimensions to accommodate the extra power needed to support its increased capacity over the NP4-12. You'll find the same is true of most SLA Alarm Batteries. Differences in size often correlate to their Ah capacities.

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