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an electrical short is an electrical drain in a circuit thats not supposed to be a constant drain on the battery, the alternator recharges the battery but an electrical short will interfere with charging process.
Most cars now have many modules that incorporate "memory" systems that require a constant low voltage supply, including your radio. Most batteries will hold enough charge to last a month without going completely dead. Not sure what you consider "extended period". If storing for more than a month, you could either put a 2 amp "battery tender" on it or disconnect the battery (but you need to know how to re-arm the security system so when re-connected it will start).
If the battery is going dead in a short time (two weeks or less) have the battery load tested after getting it fully charged. It may be good enough for day to day use but if it's not in really good condition it will get low quickly. If you have a drain that's unusual, that will require going through the entire electrical system fuse by fuse 'till you find the drain source. At this point it can be so many things that commenting is foolish as testing is the only way to verify anything.
its not a problem all cars all batteries do that if they sit after couple day min especailly long period of time you will always need a jump to get those cells in battery alive and active once car starts its good should have no problems
there is a short in the car's electrical system drawing power from the battery, causing an interuption in the power (hence the clock resetting) and killing the battery. An experienced electrician should be consulted
your problem is faulty electrical, you have to trace your electrical wires for a shorted line or an electrical component is always on causing the draining of the battery.
The alternator test will likely indicate a charging problem from the alternator that is not keeping the battery charged up.
Regardless of the alternator test, it would be best to do an electrical draw test to determine whether there is an excess drain on the battery. This can be done with an ammeter between the positive terminal and the positive battery post. This test is done with key off, all accessories off, no lights on, etc. There will be a small draw on the battery in all newer vehicles, but it should be in the order of up to 50 milliamps. If you are getting more than 200 milliamps of current draw then there is a problem with an electrical system that will drain the battery over a period of days or weeks. Once you know this is true, the electrical systems can be methodically tested.
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