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Input voltage and current

HP Pavilion Gaming Laptop 15-cx0xxx
Microsoft Windows 10 (64-bit)

Dear,

I would like to make an external battery for my computer but I don't know what current I need. My charger supplies 19.5 V and 7.7 A, but it is capable of fast charging. Does my device need the 7.7 Amps to work or can I eventually go a bit lower?

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