What does “battery of 180 AMP HOUR” mean to you?

Let me also add some information for you:

Batteries rated by amp hour (AH) capacity. The capacity is based on the amount of power needed to operate the loads and how many days of stored power will be needed due to weather conditions. Using a water analogy, you can think of a battery as a bucket the stored energy water and the AH capacity as the bucket size. The AH rating will tell " how large your bucket is "
Most battery manufacturers specify battery capacity in ampere hours. In theory, a 100 AH battery will deliver one amp for 100 hours or roughly two amps for 50 hours before the battery is considered fully discharged.
Two 100 amp hour 12 volt batteries wired in parallel provide 200 ampere hours at 12 volts. Higher votlages are ovtained through series wiring. T100 ampere hour 12 volt batteries in seres provide 100 amp hours at 24 volts.

Many factors can affect battery capacity, including rate of discharge, depth of discharge, temperature, age and recharging characteristic. Fundamentally the required capacity is also affected by the sie of the load. If the load is reduced the required battery capacity is also reduced.

The rate at which the batter is discharged directly affects its capacity. If a battery is dischareged quickly less capacity is available. Conversely, a battery that is dischraged slowly will have a greater capacity. For example , a six volt battery may have a 180 AH capacity if discharged over 24 hrs. However if the same battery is discharged over 72 hrs it will have a 192 AH capacity.