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Old and tired engine. 2.7, I would assume. Charge the battery and post the codes. Changing the valve seals only keeps it from smoking at start up. Burns the oil from the cylinders. If it smoked all the time it was the piston rings. Common on the 2.7 engines. Find another car.
Cars use the battery when they are not running. It is called parasitic drain. When the light comes on if you take it to a major autoparts stor like checker, advance or autozone, they can check it for free and tell you what the light means.
white smoke would be a sign of a head gasket blue smoke is a sign of burning oil black smoke is a sign of a fuel problem so blowing smoke and rough running do a compression test and look for a weak cylinder
Check the fuel pressure regulator. It may be bad. Pull off the vacuum hose to it and check for any sign of gas in the hose. A busted diaphragm in the regulator could let extra gas into the intake through the vacuum hose. The black smoke indicates it is getting too much gas-running rich.
Dense white smoke usually means coolant is getting into the combustion chambers. If the engine then quit and will not easily turn over (as you described 'battery is dead'), you may have one or more cylinders hydraulically locked. There is coolant in the cylinder and the piston cannot come to the top on the compression stroke because water prevents it; air is compressible, water is not. Remove the spark plugs one by one and see if they are wet or very clean (steam cleaned). If so, you need to find why coolant is getting into that/those cylinders. Bad head gasket, cracked head, cracked block.