Need more info...
How old is it?
Do you drive short distances?
Does it sit around not driven a lot?
Check for a short, bad alternator, or fried battery. If you take the car to an alternator shop, they can usually tell you for free if it's the battery or the alternator.
Apart form normal use of the battery, it is possible that the battery is getting old. Most types of rechargeable battery become less able to hold a charge as they age or may indeed have a finite number of times that they can be recharged. This will happen to phone batteries and to car batteries. When this happens you need a new battery and make sure that you dispose of the old battery properly (they contain chemicals that harm the environment).
Something is causing a drain on the battery even with the vehicle off and nothing turned on. A good mechanic can do a drain test on the battery to see what may be draining the charge. A dead cell in the battery itself will also cause the battery to go dead. Disconnect the negative battery cable overnight and if the battery is dead the next morning it has a dead cell and must be replaced. If not look for a light that is on or a relay that is stuck.
Check battery cables and alternator wiring for looseness and/or corrosion. Weak alternator--can't keep up with battery load. Check with a voltmeter A fully charged battery should read approx. 12.8 volts withou engine running With engine voltage should increase to approx. 13.8-14.2 volts. If not in this range replace
It may be that the battery has a dead cell, so you should fully charge the battery and have it tested at any auto parts store. If the battery is good then Start by checking all the accessory lights. Trunk, under hood, glove box, curtorsey, dome, all lights. If none of them are on then suspect a stuck relay. Power windows, seat, locks, etc.
Your alternator is probably rebuilt and not really new. I have had this problem several times and I have bought a new battery and alternator. The alternator keeps your battery charged and powers your electrical system, so even when driving you can lose all power in the car from the alternator draining your battery. Take the battery and alternator to an auto store and they will test both for free. Ask them about the difference in a rebuilt alternator and a brand new one. This is a very common problem.
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