It would be better battery life, as the laptop does not have to generate electricity to keep the HDD moving and such
1. Battery Life Calculation, Sleeping and Wake modes
one important specification is the cut off voltage of your system, the voltage at what your system stops working, 3V in your case. So as you say the rest of the capacity will remain in the battery but your circuit wo not be able to use it, so yes a lower cut off voltage will help to use more capacity of the battery and enlarge the life of your device. I do not see that that is taken into account in the calculator, it uses a generic 0. 85 to reduce the nominal capacity. Also does not take into account the self discharge, on that technology depending of the manufacturer can be around 1%.Another point to have in mind, is the temperature, it can highly affect the battery and in your case taking a look to the datasheet will stop working below -10C.But of course depending on your application that can be important or not.
2. Recharge dead car battery?
If it's been dead for some time, the surface of the plates have sulfated and need to be ground down so the best way to charge it is to first dump the acid out into a container, wash out the battery with deionized water, grind down the plates, adjust the ph of the acid solution with muriatic acid from a pool supply shop and fill the battery up again. It will be easier to just drive to a Sears and have them hook up their rapid charge machine, if it's sulfated and wo not take a charge they will tell you. Since most batteries are sealed maintenance free batteries, it's probably best to just get a replacement if it wo not take a charge. If you get a new battery, make sure it was not manufactured by Delco, those last about two years, try to get one manufactured by Johnson Controls, those have lasted about nine years for me. Note that there's four battery manufacturers and the various brands change manufacturers every now and then. Sears Diehard used to be only Johnson Control batteries but then they switched to Delco for a few years, they've since switched back due to the high return rate of the Delco's. All Honda batteries are Delco's which is why they die after a year and a half to two years. I've had three Honda batteries in the past, they all died at the two year mark. I did have one Diehard die in three months, they said that the delivery guys must've dropped the pallet of batteries and they replaced it for free (keep the receipt in the glove box). After my first Honda, I always get a Diehard when the Honda battery fails but insist on it being a Johnson Control rather than a Delco. With the exception of the one Diehard that died in three months, only one Diehard died while I still owned the car and that was after nine years.
3. Laptop battery won't charge?
I have a Dell 1525 as well, and bought it in July last summer. I get the same "plugged in, not charging" message. I have called Dell tech support and spent many hours on the phone just to have them send me a new power cord. After getting the new power cord, the battery seemed to be charging again, but then the same problem happened (I am now using the second new power cord they sent me and having the same problem). As what I have been able to see by searching on the internet, this seems to be a common problem with Dell laptops, with no specific solution. I have found however if you unplug the two cords from each other and leave them apart for a few minutes, that the battery will start to charge again when you put them back together (most of the time). Alternatively, I have a friend with a Dell as well, and borrowing chargers also has let me recharge the battery. I have given up on dealing with Dell tech support, because they do not seem to be able to give me any more help then what they have, but they can be reached at 1-800-847-4096.
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