Yochu 20ah 12v Battery With Bulb Ports and Usb Installed.

20 Ah means 20 Amp Hours. It means the battery has sufficient energy storage, to be able to supply current (amps) for a time (hours) that is equal to 20. It could be 20 amps for 1 hour or 1 amp for 20 hours or 2 amps for 10 hours, etc.