If your battery is good and you know your car is draining it then yes, disconnecting your battery from your car will keep your battery charged for much longer than 3 days. Your battery should stay charged way longer than 3 days in normal conditions being hooked up to your car. You should get it checked out and figure out what is draining your battery so fast.
usually means that the alternator is not charging. So the battery is being drained.
unhook battery
dead cell in the battery or something is on that is pulling power from the battery.
with everything off unhook the negative terminal an place a voltmeter between the battery and the cable if the needle comes up you have a draw. start pulling fuses until the needle drops when it does you've found your current draw
the positive wire that recharges the battery after being drained from the starter
That depends on the amount of power being drained from it.
It means that you have an alternator fitted. An alternator needs an amount of battery voltage to generate electricity. A generator/dynamo will make voltage without a battery being present.
have you checked the alternator??? that's the first thing that comes to my mind if your battery is being drained
It's most probably the alternator. It's not putting any charge back in the battery. Can also be a dead cell in the battery or something is on pulling power from the battery.
Had the same problem, changed the positive and negative battery cable heads, this stopped the drain. Check and see if the cables are good first.
Not with out being attached to a battery charger. On a 10 amp charger in 8 hours it will charge enough to start the car, allowing the battery is god enough to charge
Battery Idiot LightIf by battery light you mean the instrument panel charging system warning light, then that means that more electricity is flowing out of the battery than is being put into it.The charging system is not putting out as much electricity as the electrical system is using. In other words, the battery is being "drained" rather than being charged.