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Both are giving the data about storage capacity of a battery. For Ex. 12V 7AH Battery will run 7 hours if you are driving the load of 1Amp continuously. But 12 12AH Battery will run 12 hours if you are driving the load of 1Amp continuously.
12v , 7Ah means its the capicity of Battery , if load current is 1 amp then battery runs for 7 hrs. AH = Ampere* Current. 12v, 7ah 20hrs its shows load current is 7/20 amp.
Yes, both batteries perform the same, but the 7ah battery holds more charge.
Yes it will work quite well.
Yes, the amp hour rating gives you an idea of the capacity of the battery and charger. The charger and battery need to have the same voltages. i.e. dont try to charge a 6v battery with a 12 v charger. The battery will be charged until it is full.
the 80ah battery will give out power for longer without being charged in the case of a car it means it would take longer before the batery would run flat from leaving something switched on
A charger designed for a 12 volt battery should not be used to charge an 8.4V battery. It is likely to damage the battery and in the worst case can cause a fire. There are some chargers that can be used with a variety of battery voltages and chemistries but unless you are certain that the charger is safe and effective on a different battery voltage, assume that it cannot be used.
1 watt will do the job.
Depends on the current draw of what you hook it up to. At a draw of 7 amps (80 watts) it'll last for one hour. At a draw of 1 amp(12 watts) it'll last for 7 hours, ASO.
The current rating on a charger ("1000 mA", "500 mA"), usually means the currentthat the charger is capable of supplying if it needs to. It's NOT the current that'salways being pumped out.If your 7AH battery needs 500 mA at some time during the charging operation,then a 1000mA charger is capable of supplying it.
A 7ah battery will hold a 1amp draw for 7 hours. With a smaller draw it will last much longer. In this case more than 3 times longer. 1 amp / .3 amps(300mA) * 7 = 23.33 hours to fully discharged.
Commonly this figure is used for battery used for cars or UPS. 100Ah means, you can draw 100 Ampere current for one hour. Like a battery 0f 12Volt,7Ah can be used for a circuit which draw current of 1 Amp. can be used for approximately 7 hours.