Help with battery calculations

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Timothy4

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Currently working on a project with my son. He is using this as a learning experience - trying to convert an old nintendo 64 to a handheld game system. he is doing really well with the soldering and the repair work however We are having difficulty figuring out the size of battery we will need. Data off the power supply to the unit is

Input: AC 120V 26W 60Hz
Output: DC 3.3V 2.7A
DC 12V 0.8A

We were hoping to get 8 hours out of the battery between charges, however I believe this may be impractical but we would like to get at least 4 hours. could someone please advise as to the size of battery necessary in amp-hours and if possible a recommendation for purchase. Please remember this is supposed to be a portable project so size is important.

Thank you in advance for your time.

Tim
 
Timothy, I believe this question falls outside the scope of this forum.

This site is designed for:

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* This NEC? Forum is for those in the electrical and related industries. Questions of a "How-To" nature by persons not involved in the electrical industry will be removed without notice.

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I'd search the internet for an electronics forum. Good luck in your project.
 
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