What does 4.0 Ah mean?

Ah is an abbreviation for ampere-hour, or amp-hour. This the total amount of charge a battery can deliver in one hour. A power tool that continuously draws 1.0A of current will completely drain a 1.0 Ah battery pack in one hour (under ideal conditions).
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What does 5 ah mean in a battery?

Lead Acid Battery Amp Hours (AH) Specification Defined. The Amp Hour (AH) specification provides a measurement of battery capacity. A typical Amp Hour specification might read, “100 AH @ 20HR”. The specification is saying that the battery will provide 5 amps of current at a useable voltage continuously for 20 hours.
  • Can you use a 12v 5ah battery to replace a 12v 4ah battery?

    The only difference is in the amp hour capacity verified by the slight weight difference. Now most people choose to upgrade their 12V 4ah battery to the 5ah version. But if you wanted to save a little cash, or the 4ah was all that was available you could replace a 12V 5Ah battery with the 4 amp hour one.
  • What does 3 Ah mean on a battery?

    Amperes. Ah is an abbreviation for ampere-hour, or amp-hour. This the total amount of charge a battery can deliver in one hour. A power tool that continuously draws 1.0A of current will completely drain a 1.0 Ah battery pack in one hour (under ideal conditions).
  • How long 1.5 Ah battery will last?

    2.0Ah 12V and 18v Battery Packs. As you might already know, Ah refers to the amp-hour rating of a battery. 1.5Ah means that a battery pack can deliver a steady 1.5 amps of current for one hour. A tool that draws 0.75A from a 1.5Ah pack will have two hours of runtime, and one with a 3.0A draw will last for half an hour.

Updated: 3rd October 2019

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