yes. it can also provide 1 amp for 55 hours. do you see the relationship? the less current you draw the longer the battery will last. the more current you draw the shorter the battery will last.
This true to a certain extent... typicaly a 100Ah battery (tested at the 20hr rate) will provide 5A for 20hours, but might only do something like 98A for one hour, or 175A for 30min. The more current you draw the less accurate the equations stays... this is why you will typically see a rate quoted along with an Ah rating (ex. 100Ah C/20 means tested for 20hrs.)
