merlin
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I took my old Acer laptop to the shop to have the battery replaced. The shop didn't have the "tools" to open up the case and didn't have a battery anyway. They said "we will have to send it to Khorat". I didn't bother.
The latest model (Acer again) apparently has a battery that cannot be replaced!
Mine's a Lenovo. It has a battery that can be replaced by anyone with a degree in astro-physics and another in engineering. The body has to be dismantled to access it, and various components removed and then replaced. My old HP had one that was easy to access - just slide a button to one side to remove it. Easy, but that laptop kept overheating and then shutting down - a bit like me on a hot day!