ANY REASONS MY BATTERY KEEPS WEARING DOWN NEEDING TO EITHER BE CHARGED OR JUMPED

What is your question?

BATTERY COULD BE FULLY CHARGED AND RUN FINE FOR A WEEK OR SO BUT THEN MAY REQUIRE A JUMP OR TO BE CHARGED TO KEEP RUNNING. LATELY BATTERY WAS CHARGES AND LASTED 4 STARTS. BOUGHT A NEW BATTERY 6 MONTHS AFTER I BOUGHT MY TRUCK. RAND FINE FOR A SHORT WHILE THEN IT WAS NEEDING TO BE CHARGED EVERY 7-10 DAYS

How long has your 2009 Nissan TITAN had this problem?

SINCE I BOUGHT IT USED