Confused about changing my laptop?

I currently own an almost 2 year old Toshiba Satelite C650. It has average specs, Core i3 (1st Gen), 320 GB, 8 GB ( It was initially 4 GB). But since few days it is not giving me enough battery power. It lasts for only 2 hours maximum. Except this, it is working fine. I am thinking to change it but I am confused whether to keep it or not. I am a computer science student & an intern developer too. I am a specky too, so screen is a big priority for me. Moreover I shortlisted few laptop models for myself if I am going to change this machine:

1. Macbook Pro (Base)
2. Macbook Air (Base)
3. Dell Latitude E5430
4. ThinkPad T430
5. Dell XPS 13
6. Sony S Series

What do you think I should do? Change it or Keep it?

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I have to ask.

If it's just the battery why not keep it on AC as much as possible. Batteries have a 300 cycle rating so in 18 to 24 months the battery is gone if the owner didn't avoid battery use.

And yes, that's a fine list.

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Each intel

generation processor runs more efficiently so if you buy a new battery for the old one it will be cheaper but you won't get what you can with a newer processor.

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