[DoubleF]

If you're only using around 115GB, I'd suggest getting the 240GB SSD for around $90 USD or so. A fresh installation of OSX may also help. I also think you should be able to buy that battery replacement for around $45 USD. Both should be available via Amazon. Both combined should be able to impress you in comparison to what you currently have, but not in comparison to a new Apple Macbook. I don't think it's worth adding RAM to the unit 4GB is enough.



Looking at this, replacing a battery/SSD looks pretty easy. Just follow this or other youtube videos and do it yourself. There's so many guides that you shouldn't have a problem doing this even for the first time. The two upgrades for around $150-200 should be a huge breath of fresh air, but not so expensive that it makes way more sense to buy a new laptop.


EDIT: I just noticed on the buy and sell gasman is selling a laptop with similar specs and has upgrades you're looking into. Maybe consider PMing him and ask him how difficult it was to do the SSD swap? The battery swap should be a walk in the park in comparison.