>Wow this Thinkpad can be upgraded to 32 GB of RAM and 4 TB SDD.
T460 uses DDR3L SoDIMMs. 16GB (2x8) runs ~$30 on Amazon. However, 32GB (2x16) is considerably more, over $200, probably because that config isn't common 6 years ago.
Likewise, T460 uses 2.5" SATA SSD, which starts at $200. That costs the same as a 4TB PCIe4 NVMe SSD, but is nowhere as fast, nor can it be re-used when you move to newer laptop. Ditto the RAM. In short, you'd be paying top-end money for slow and dead-end parts.
>The external HDD can come next.
An ext USB 3 HDD is not a replacement for internal storage because of the USB 3 througput bottleneck. Moreover, you lose the portability of a laptop when you have to lug around ext devices just for basic functionality.
For battery, figure on $30 DIY battery replacement.
For a more practical config--16GB RAM $30, 1TB SATA SSD $60, battery $30--you're looking at ~$200 (incl $75 laptop) for a 6-year old laptop, with old and slow components that can break any time, and no warranty.
Some people would fixate on the bottom line cost and call that a bargain. I'm not one of them.
Edit:
>unless the seller is going to let you use up it's power, then sit through a full recharge, then use it up again; there is really no other way to experience the available battery-life and charging strength.
You can get a good idea of battery life by opening up a terminal and running "powercfg /batteryreport