the laptop batteries would it be overheated or something?

No, it’s perfectly fine. Laptop batteries and their charging systems are intelligent - that is, it recognizes both the state of the battery as well as the presence of power direct from the power supply. That’s why, for instance, if you remove the battery entirely, but leave the power supply plugged in, the laptop will power up.

The laptop will recognize when the battery is charged 100% and then go into a ‘trickle’ charge mode, keeping the cells ‘topped off’, while using the power supply as the main source of power.

You’re perfectly safe keeping the laptop running after the batteries are 100% charged.Do i need to charge my brand new laptop batteries for 8 hours?
i bought a new laptop batteries for my Dell Inspiron 500m laptop,Do i need to charge my brand new laptop batteries for 8 hours?

Its best to charge any new batteries fully when you get them, but its not a huge problem with a laptop, just plug it in overnight and it’l be fine.

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