I am currently getting a a message saying "consider changing laptop battery" when my battery gets to 10%.
I also have a red X over the battery Icon all the time. I think my battery is ok though.
How can I check? Or how can I remove the error?
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Your laptop has software for monitoring the battery - showing the current charge, how much time it estimates you have before you need to recharge etc. This may also have access to historical data of charging times etc. or the expected charge times etc of your battery.
You should therefore consider changing the battery. You should be able to find one on-line. Either search for your laptop make and model plus the word "battery" or take out the battery and search for the make/model of the battery itself.
As long as you go for a reputable supplier (Amazon perhaps) then there is less likelihood of getting a counterfeit battery, or if there is a problem, more chance of getting a replacement or your money back.
I'm assuming this is an older system and the battery has gotten a considerable number of cycles, and a low capacity compared to the design capacity - MS has a writeup on this in their help site
If the battery actually works fine however, this may mean that something is off - some systems apparently misreport their battery capacity, and as such give the warning even when everything is working fine - a bios update may fix this.
There seems to be another fix for it here , tho this seems to be just settings tweaks
Whether you ultimately replace the battery or not, you should visit this website:
Battery University - one of the most comprehensive resources for batteries (of all types)
The maximum capacity of Lithium-Ion batteries decreases over time. Several factors contribute to how fast they degrade (such as heat, moisture, and usage).
When Windows detects that the capacity has degraded by a certain amount, it will notify you that you should replace the battery. This will ensure that your system maximizes its potential battery life.
If you keep this computer plugged in most of the time, then you have little to worry about with this message. However, if you like mobility and the ability to use your computer for extended periods without needing to charge, then you should consider buying a new battery for it.
DO NOT buy a used battery, as it may also have degraded considerably and would be little better than your current one. Also, buying new batteries straight from manufacturers can be very expensive (usually a battery straight from a manufacturer costs a minimum of about $120). If you are looking in to buying a new battery, sites like Ebay, Amazon, and NewEgg are good places to start. Good luck!