Just because a part is new doesn't always mean it's good. A little more history/ info here would help, but you can do a simple test to see if your alternator is working. Disconect one cable (either one) from the battery and charge it on more time. Reconnect it to start the engine, and then disconect it with the engine running. If the engine stays running with the battery disconected the alternator is working. It is possible that you new battery is shorted internaly If you suspect this might be the case take it back to where you got it and have them check it.
There is a consants draw of power some where
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WhAt specific vehicle is this and did you say you have. New battery and alternator do you drive the vehicle everyday. More than five km. Do you have device that are powered all night( ei radio, remote starter)
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