# Batteries

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#### Ian The Plumber

##### New Member
what's the difference main between 2ah and 3ah batteries?
Is it worth the extra cost?

#### crutschow

##### Well-Known Member
The ah rating is the capacity of the battery. Thus a 3ah battery will have 1.5 times the capacity of a 2ah battery ( and last 1.5 times as long powering the same circuit before it goes dead).

Only you can determine if the extra capacity is worth the extra price.

#### Ian The Plumber

##### New Member
Thanks Carl, perhaps obvious to some but the questions are only easy when you know the answer. Thanks again, Ian

#### Willbe

##### New Member
And, due to Economy of Scale, 3 A-h should cost slightly less than 3/2 of 2 A-h.

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