# Amps, amp-hours, and power

#### pidja105

Oct 16, 2015
106
Hello,
If i have two batteries with 60Ah, and both give me 4800W,
but one of these batteries can give 4800W for 0,15h, and second give me same wattage but 12,5 hours, I have more time with same power, can i get smaller time from second battery but bigger power?

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#### Gryd3

Jun 25, 2014
4,098
Hello,
If i have two batteries with 60Ah,and both give me 4800W,
but one of these batteries can give 4800W for 0,15h,and second give me same wattage but 12,5hours,I have more time with same power,can i get smaller time from second battery but bigger power?
Power is the product of both voltage and current.
Your battery will only put out a predetermined voltage, so in order to get more power, you need to pull more current.
Of course, if you pull out more power, it won't last as long... but it's more complicated than saying "I can get half the time if I pull twice the power" ... because of how batteries work, the harder to pull from them, the less 'capacity' they have. So if you are pulling twice the power from a battery, it will only last less than half the time that you got prior.

#### Martaine2005

May 12, 2015
4,558
Beat me to it Gryd3,
So I scrubbed what I was going to say except it sounds like one battery is deaded, gonner, all dried out!!!!
If you're using both batteries the same way, and one lasts 0.15 mins and the other lasts 12.5 hours.....

To get more power you will need to wire the two in parallel to double the amperage. However, the deaded one will help dead the other quicker....Comprende?

#### BobK

Jan 5, 2010
7,682
If you have a battery that is rated at 60AH and it can put out 4800W for 12.5H, we can calculate the voltage of the battery as follows:

4800W x 12.5 hours = 60000WH

60000WH / 60AH = 1000V

That is one hell of a battery!

Bob

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