If you have a built in battery, then you can upgrade it.
The notebook battery is an important feature to consider when buying a new notebook. The type of notebook battery included by the manufacturer determines the laptop's battery life. Most notebooks come with a 6-cell battery, but a few notebooks come with a 9-cell battery. The higher the number of cells, the longer the notebook can function on its battery. Many laptop manufacturers allow you to upgrade to a higher-quality battery for an additional cost when buying a new laptop.
Memory is far and away the most efficient upgrade for any laptop.
Laptop graphics cards are generally considered to be impossible to upgrade.
I was trying to upgrade my laptop today
can i upgrade my buffer on a toshiba laptop running win 8.1
No.
The battery is a component of the laptop but is not a part of the Laptop itself.
battery upgrade
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no,on Portable laptop power supplies typically have larger battery capacity than laptop battery , so the battery more durable
Upgrade your laptop to have an SSD instead of an HDD
if the laptop battery over charged, the laptop battery will get hot, Seriously will damage the battery, but now most of the laptop battery have a overshoot protection, when the battery was full charged, it will stop charging automatic, so it won't worry about it