ACER ASPIRE 4752 SSD,RAM UPGRADE AND THERMAL PASTE REPLACEMENT 

I have also this model laptop

Processor is upgradable or not

Its worth for upgrade as its not a outdated laptop yet.Thermal paste replacement is highly recommended. Replacing it every two to three years is a good idea and will keep your chip at its optimum.

you can, but it's better to install a second memory module for 4GB or 8GB so-dimmDDR3-1333 1.5v, make RAM 4GB+4GB or 4GB+8GB.

Yes, the Acer Aspire 4752 (MS2347) with an Intel Core i5-2450 CPU and 4GB DDR3 RAM is compatible with Windows 10. The system requirements for Windows 10 are generally lower than those of its predecessor, Windows 7. Your laptop meets the minimum requirements for Windows 10, and it should be able to run the operating system without any issues. Before upgrading to Windows 10, it's recommended to ensure that your laptop meets all the other system requirements for a smooth experience. These include having sufficient storage space, compatible drivers, and any necessary BIOS updates. Additionally, it's advisable to back up your important files and create a system restore point before proceeding with the upgrade. You can check the official Microsoft website or the Acer support website for more information on upgrading your specific laptop model to Windows 10 and any potential considerations or driver updates that may be required.

For cleaning can use electrical contact cleaner solutions. Removes Contaminants: Dissolves dirt, grease, oil, oxidation, and other contaminants that can create resistance and interfere with electrical signals. Improves Performance: Restores proper contact, reduces voltage drops, and helps prevent malfunctions in electronic equipment. Protects Components: Many contact cleaners also leave a thin lubricating film to protect against further oxidation and contamination. Removes Contaminants: Dissolves dirt, grease, oil, oxidation, and other contaminants that can create resistance and interfere with electrical signals. Improves Performance: Restores proper contact, reduces voltage drops, and helps prevent malfunctions in electronic equipment. Protects Components: Many contact cleaners also leave a thin lubricating film to protect against further oxidation and contamination.

BELOW 100USD.

You can install an i7-2630qm processor (4 core, 8T) in this laptop and the temperature will be about 75-80*C under load. You just need to use good thermal paste like Arctic MX-2, MX-4 and clean the radiator from dust every 2-3 years and change the thermal paste. RAM max 8GB+8GB DDR3-1333 2Rx8 1.5v, can do 4GB+8GB.

Not recommended as it's a old laptop,not worth value of money.

Yes, this device can support 8Gb ram. In dual stick configuration.

max 8GB+8GB DDR3-1333, DDR3-1600

​@@my1pcworldbut how?

CMOS Battery in replacement done for the CMOS battery powers your laptop's BIOS firmware, which is responsible for booting up your computer and configuring data flow.