A 1 hour amp hour battery should last for 100 hours if you draw a constant load of 1 amp.
If you're drawing 5 amps from the battery then the 100 amp hour battery should last 20 hours.
A battery's amp hour rating is based on a consistent load of 5 amps.
What that means is that a 100 amp hour battery that has a constant load of 5 amps on it should last 20 hours.
1 amp hour is 1 hour of electricity flowing for 1 hour.
For example if you have 1 amp hour in your battery then you can draw 1 amp for 1 hour before the battery is depleted.
1 amp hour means that 1 amp of current will flow for 1 hour.
For example if you have 1 amp hour battery the battery will have enough power to flow 1 amp for 1 hour until the battery is dead.
The difference between amps and amp hours is that amps are a unit of electrical current and amp-hours are units of current storage capacity.
An ampere measures electricity.
Volts represent the difference in potential that drives amps to flow through the closed circuit.
Therefore, while amps represent the volume of water, volts carry the water through the circuit.
The meaning of Ah in battery terms is Amp Hours.
The A stands for Amps and the h stands for hours.
So for example if a battery says it has 100 Ah it means the battery has 100 Amp Hours.
An ampere hour or amp hour is a unit of electric charge, having dimensions of electric current multiplied by time, equal to the charge transferred by a steady current of one ampere flowing for one hour, or 3,600 coulombs.
The commonly seen milliampere hour is one-thousandth of an ampere hour.
As the name suggests this means how many amps the battery can deliver in an hour.
For example, a 12V lithium battery with a capacity of 100Ah can deliver 100A to a 12-volt device for one hour.
The same 100Ah battery could supply power for 4 hours (100/25=4) to a 25 ampere device.
One ampere-hour (or amp-hour or Ah) is a current of one ampere flowing for one hour.
The amount of charge transferred in that hour is 3,600 coulombs (ampere-seconds).
A milliampere-hour (mAh or milliamp-hour) is a thousandth of an amp-hour.
An amp-hour is one amp for one hour, or 10 amps for 1/10 of an hour and so forth. It is amps X hours.
If you have something that pulls 20 amps, and you use it for 20 minutes, then the amp-hours used would be 20 (amps) X . 333 (hours), or 6.67 AH.
The key is to use the watts you know to calculate the amps at the battery voltage .
For example, say you want to run a 250 watt 110VAC light bulb from an inverter for 5 hours.
Amp-hours (at 12 volts) = watt-hours / 12 volts = 1470 / 12 = 122.5 amp-hours.
What is the difference between amp-hours and watt hours?
Put simply, the power of an amp-hour (or, thus, mAh) depends on the voltage, whereas a watt-hour is always a watt-hour.
Other variables and terms, such as cycle life and C-rate, also affect the real-world available energy in a battery, but using watt-hours at least eliminates the ambiguity of the amp-hour.