A laptop battery will eventually lose it's capacity, but it should last several years at least before it does. Of course you have to be sure to follow directions on the initial charge or you can lessen it's capability.
Most batteries of any sort come with some charge, though almost never to their full capacity, and should be charged before their first use. Charging them all the way wouldn't do any good, since the charge naturally drains after a few weeks or months, thus it would be more expensive to keep them in inventory.
Laptop batteries should be allowed to fully discharge once a month for longer performance. Leaving a laptop plugged in all the time can take years off the life of the battery. If you are going to store the battery for more than six months. let it drain to 50% before storage. Storing a batter with less power may leave it in a deep discharge state, and it will not hold a charge when you try to use it again.
It depends on usage. But laptop batteries last anywhere between 12-24 months. My laptop battery needs to be replaced because it will not charge all the way and it is 19 months old. If possible, Replace it with a 9 cell for longer life and it will hold a charge longer too.
they don't i have left batteries on concrete for months and had on loss of charge.
The question about the "ratio of 8 batteries in three months" is unclear as it lacks context. If you are referring to the usage or consumption of batteries, a ratio typically compares two quantities. For example, if 8 batteries are used over three months, you might say the ratio of batteries used per month is 8:3. Please provide more details for a more accurate response.
Consult the manufacturer's documentation for how to extend battery life on a given laptop. Things will differ. From what I have seen in the documentation I have read it does nothing either way to remove the battery, unless you swap in a fully charged one. (I have a couple of laptops that I do exactly this, I have 2 batteries for each so I can swap in the fully charged one, then when both are discharged I recharge both. For both machines the manufacturer suggested always deep discharging batteries to extend their life.) Apple seems to recommend keeping both permanent and removable batteries near full charge most of the time, with an occasional deep discharge followed by fully recharging them. The exception to this is if the machine will be unused for several months, the battery should be discharged to about 25% of capacity before putting the machine in storage, then immediately fully recharged after removing the machine from storage before use. But other laptop manufacturers may have entirely different recommendations.
Mostly in spring months from losing their winter coat,which is always when its the thickest.
Batteries should be changed every 6 months. Some can last up to a year.
Babies typically stop losing their hair around 6 months of age.
The life span of a laptop battery depends on how much you use it. The average life span of a Dell laptop battery is anywhere from 18 to 24 months. You should consider replacing your battery when it stops being able to meet your everyday needs.
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.
because it happens twice a year so you will always have fresh batteries put in every six months.