AH is the unit and refers to the battery capacity. Battery capacity is one of the important performance indicators to measure battery performance. It indicates the amount of power discharged by the battery under certain conditions, that is, the capacity of the battery.
The 12V 7AH battery is a small power supply. According to the formula: 12V × 7AH = 84W · H, 84W · H ÷ 1000W = 0.084H = 5.04 minutes. So it can last for 5 minutes.
1AH indicates that the battery is discharged with a current of 1 amp and can be discharged for one hour. If discharged with 0.5 amp, it can be discharged for 2 hours.