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Remaining Time

how to calculate the time remain in a battery(LeadAcid if it matters  12v-7.5AH) with a load(2Amps) connected on it?

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Amp Hours (AH) tells you how many amps the battery can sustain for 1 hour until become completely flat.

7.5 AH battery can supply 7.5A for 1 hour and then will be depleted.

Amp Hours / Amps (your load) = Hours the battery will last for.

7.5 / 2 = 3.5 hours.

Thanks a lot you are very helpful person.