A 7000mah battery will take 7 hours to charge from full dead with your 1A charger. (Capacity/charge rate) 1A = 1000ma. If it's a float charger, no problem leaving it on indefinitely, but a lead acid battery holds a charge for a long time.
Also question is, what do you mean by charging on AC?
It is simply a USB cable, which allows my tablet to charge from a DC USB port in a car or laptop. When you plug in to AC power – whether you plug in to a 120V or 240V outlet, or use J1772 charging equipment – your car converts the power to DC.
How much voltage is needed to charge a mobile phone?
For mobile phones and other mobile devices like the Kindle that charge with USB, the voltage is typically 5V. A laptop charger might be as high as 20V or 25V. You can usually find the voltage your device needs on the device itself, on the battery, or if all else fails, on the manufacturer's web site.
Is a 12 volt car battery AC or DC?
A car battery is DC. However it is charged by an alternator, which is usually a three-phase AC generator. Of course the output of the alternator windings is immediately rectified to DC inside the alternator.