It means that the battery loses certain percentage of charge just from sitting unconnected without being charged. The best answer would be to purchase a battery maintainer, such as the "battery tender" brand, or any other that is specifically designed to maintain your type of battery during storage.
If you do not charge the battery for a long time, it loses its capacity. Battery develops internal resistance, and the chemicals start depositing. That causes problems. I hope the post was able to answer on what happens when the battery is fully charged, but still connected, and other questions around charging and battery.
The problem is that even when the laptop shows that the battery is fully charged, it shuts off when the charger is disconnected. Laptops rely on their batteries for their portable working and if the battery stops functioning properly, laptops lose their portability option.
Of course, a fully discharged battery is fully useless. The article linked has other useful references, somewhat dry. If you can add a battery tender (not a trickle charger) you will have a much stronger chance of keeping the battery healthy.
If your laptop battery is not working, there might be a problem with the connection of the battery to the laptop. To check if the battery is properly connected, start up your laptop, connect it to a power source, and remove the battery. If your laptop shows that the battery has been removed, put it back in and check if it now shows that the battery has been connected.
A maintainer will stop charging when the battery is "full" and only charge it enough to overcome the shelf loss. Never leave a "trickle charger" on a battery you are not keeping track of and remove it when the battery is charged. A trickle charger is good in normal charging as it will damage a battery less then a 20A or 50A charge rate would.
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There is a chance that if you reseat the battery and boot it up with the power adapter plugged that it may work again. I would recommend calibrating the battery as well and leaving it on...
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ford
The freezing point of a fully charged battery is listed as -80 °F and a fully discharged battery freezes at 20 °F. That may be colder than your expected temperatures, but it''s not a good idea to risk it. Of course, a fully discharged battery is fully useless.
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