Spent an hour or two replacing a battery into a ~7 year old Chromebook - ASUS C302CA. This has been my daily interface to the Internet and has done, and is still doing, such a great job that a $75 upgrade to a new battery seemed like a good bet.
Have gone from 2 to 3 hrs of battery life back to around 8 hrs. Awesome.
Can highly rate thinking about keeping ageing tech alive if it's still fit for purpose. Better than just chucking it out and replacing.