I’ve too have had the same problem for a couple of years, I’ve tried every one of the above remedies and none of them have worked. That stupid little battery can cause issues like a clock that’s wrong when it gets weak or dies whenever I have a problem with a computer booting first thing I do is change that stupid battery if it’s a year or more old. On cheap tablets the batteries are hard soldered and may not be easily obtainable to replace, on more brand name and higher priced tablets the battery has a connector that slides into a socket and shouldn’t be too hard to get either from the manufacturer or off ebay oem. My older Dell i5 is a pain you have to take all the guts out to reach the battery holder on the bottom of the motherboard, my samsung galaxy note tablet backs its hardware settings up with the main battery as with most tablets. Laptops and 2 in 1 machines and tablets can be a rougher battery to reach, some laptops have a panel on the bottom that you simply unscrew to access the battery, my dell inspiron 15 you have to pop off the bottom of the machine and the battery is in a holder right there by the hard drive tray.
Just take it out and pay attention to which side the “+” sign is on so you install the new one properly. Recently built PC desktop machines are usually easy, just open the side of the case and you should see the battery mounted either flat or sometimes vertically. When a new machine is built the tech enters the settings and manually sets the time and date on the motherboard when the battery gets weak often the time will be wrong on the motherboard itself and at bootup windows might be getting the time off the motherboard and thus will be wrong until it gets current time off the web…of course if you have no internet connection it won’t be able to get the time off the web. When I build a system I always put a new battery on the motherboard because you’ve got no idea how long that may have been sitting on a shelf in the warehouse the battery draining the whole time. Most machines use a big hearing aid battery and they generally can be depended upon to last about three years. All current PC and I believe Apple as well use a battery to backup a small amount of information (in volatile RAM) that the system needs in order to start (aka CMOS). For those having issues after booting from (cold=machine off) there may be another consideration.
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