The main cause of battery drains is a bad electrical system. The electrical system is normally powered by the alternator and once the alternator goes bad the battery has a hard time holding a charge,
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Radio Use when engine is not runningYes, use of the radio when the engine is not running will drain the battery. Also, IF the use of the radio requires the ignition switch to be in the ON position, then any other devices [such as on-board computers, electric fuel pumps, etc.] that are turned on when the key is on will also add drain to the battery.IF your vehicle ignition switch has an "accessory" position [usually one "click" counterclockwise from the OFF position, then only the accessories that you turn on, will drain the battery.
If you use the radio without the engine running you will eventually discharge the power from the battery. It should be fine for a couple of hours, If not, your battery may need replacing.
bad ignition switch, bad battery, bad alternator/regulator,
Turn your key to accessory, but watch out, it will drain your battery
there is a 17 mm bolt under the engine . through the skid plate remove this bolt and drain oil completely. then replace oil filter on right side of engine ( black o ring to face cover ) replace alum. washer on drain bolt and reinstall . torque to 18 ft/lbs .refill with oil on left side with 2.2 liters of 10w40 . start engine and allow to run for 3-5 mins. at idle . stop engine and check level on dipstick on right side of engine. add oil to level