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# When to Use Laptop Battery? [duplicate]

If you are using an AC adapter all the time, the battery is not charged or discharged at all, and because of that it's resource is not depleted. Battery's life only decreases when current flows through it, or, in the other words, if you charge or discharge it

1. Will a computer boot without a CMOS battery?

It will power up ok, but it will have lost all its CMOS configuration information, so it won't necessarily boot until you reset the configuration to match how the machine is actually set up.Most machines will correctly auto-detect most of the configuration (amount of RAM, HDDs/SSDs present, CPU clock speed, etc) but if the machine previously had an unusual config - maybe it has an internal hard disk but booted over the network - then it won't boot until properly configured.And then, of course, next time it's powered off, it will lose the config again and you'll have to re-do it. Will a computer boot without a CMOS battery?

2. Capacitor connected directly with battery

Both the battery and the capacitor have an internal resistance.Your capacitor looks a bit like this on the inside:simulate this circuit - Schematic created using CircuitLabOf course, I do not know your capacitor, so I do not know the exact internal resistance, but 3Ohm will be a close enough approximation.The same happens in your battery, so in fact you are doing this:simulate this circuitSo now for a tiny amount of time the current will be maximum, but it is only about 0. The moment it is at 67% can be calculated by R * C.So in the example that is: t(67%) = R * C = 10 * 220u = 2.2ms.But if the capacitor is 22000uF (= 22mF) then the RC-time, as it is called, will be 220ms, or 0. 22s for it to charge with a total resistance of 10Ohm. But with a capacitor that size it might also have a slightly higher resistance, so that will make it even slower.And then it's only at 67%. The next 30% will take much more time.EDIT: Note; increased the 9V-bat resistance as per Nick's comment.

3. how long would this battery last?

That is like asking "How long is a piece of string?" How long a battery lasts is very much a combination of what kind of things you will be doing, and how efficient the hardware is. If you are watching a movie, the battery life is going to be limited because spinning a DVD drive is costly in terms of electricity. If you are doing a lot of disk intensive work, that eats up the electricity. Booting is something that takes up a lot of power, so if you are off and on, it wo not last long. If you load something into memory and spend a lot of time reading, or you browse the internet with an ethernet cable, your power consumption would be low. If you dim the backlight on your display it will be even lower. If you run it as bright as it will go, it will drain the power more quickly. If you use wireless, it will drain quicker. If the laptop has the ability to let the hard drive spin down rather than run all the time, then it will use less power if you do not go to the drive much. There are so many variables that just looking at the battery is not going to tell you much. But of course the larger the battery, the longer it is going to last on any given machine..... and the more it will weigh. The manufacturers will sometimes give battery operation figures. Of course those are going to be like MPG figures on cars before government regulation on them. They are ideal situation, but usually give you a fair idea of how they relate to one another, but you will probably never see those figures in real life.

4. Best battery for my SUV?

I have had a lot of luck with Wal-Mart batteries. They are of good quality for the price and come with a 1 year free replacement. Other batteries such as Die-Hard (Sears) and Interstate are also good quality with good warranties, but cost more than the Wal-Mart batteries do. Hope this helps.

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