Are you using a cheap battery or a quality name brand? Have you changed the alternator? If so it may not be the right part Agreed. Check the alternator for proper function. Many parts stores will check this for free.
They don't. Normally the 9 volt alkaline batteries in a smoke detector need to be replaced every year. If yours needs to be replaced every 6 months then something is wrong. If you are using a standard battery and not an alkaline battery it may only last 6 months. Use nothing but alkaline batteries. You sould hear a chirp from the detector when the battery needs replacing. A hard wired smoke detector has a battery back-up that should last around 2 years. If it only lasts 6 months then there is no power to the smoke detector and it is wired wrong or the wiring has come loose. The only reason to recommend changing batteries every 6 months is bacuase people tend to not change the batteries as they should. It has been proven by tests that about 35% of smoke detectors in homes have dead batteries.
Since Saturn is a gas planet, you wouldn't ever "get a spaceship on Saturn" - either near it or in it. It would be a lot of effort and money - Saturn is the 6th planet, Mars the 3rd, so it'll be quite a bit farther to reach it. Mars is 193 million miles from the Sun, Saturn is 888 million miles from the Sun; 695 Million more miles or 6.5 times farther. Since it is estimated a one way trip to Mars will take 3 months, a trip to Saturn will take 19.5 months or over a year and a half to get there. Return trips make it 6 months for Mars, 3.25 years for Saturn.
The expiration date given on batteries is to limit duration of liability/ responsibility to manufacturer. Most of the sealed and properly stored batteries will be good enough to use few months after expiration but not after few years. At the same time it is risky to use old batteries as they tend to leak spoiling expensive equipments.
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