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Help, need answers about power source and display

Forum Homebuilt Systems : General Homebuilt - Help, need answers about power source and display

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Ok, not sure if this is the right place, but i Need some professional advice.
Could someone please answer these few questions? Google keeps giving me results that are contradicting each other..

1. In a mobile system powered by laptop batteries, does 2 batteries mean double battery lifetime? How would one recharge this sort of setup with only one mains adapter?

2. What are the average power requirements for a small sized (up to 5-6 inches) LCD screen?

again, sorry if this is in the wrong place or something, but i'm on a tight budget and really want to plan everything in detail to get max out of the finances i have.

Thank you

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