Personally, I like business-class laptops because they're usually certified to be more durable. Lenovo and Dell business laptops are usually milspec (military specification) for durability.
For $549.00, you can get this 11 inch Dell Latitude 3180:
https://www.dell.com/en-us/work/shop/de ... ops?~ck=bt.
It's got a quad core Celeron that won't win any speed awards, but it ought to be fine for basic word processing and giving Powerpoint presentations. It has 8 GB of RAM and a 128 GB SATA SSD, plus Windows 10 Pro. A full-sized HDMI port and two USB 3.1 type-A ports. A decent sized battery (42 Whr), and with only an 11 inch screen, that battery ought to go far. (Screen size affects battery life a lot.) Enter "SAVE35" at checkout and the price comes down to $509. Plus, at checkout, for about another $100, you can buy a Dell-branded external battery pack ("Dell Power Companion") that is compatible with the laptop, so that could extend your battery even more. The description says it is designed to be durable, but I'm not sure if it is milspec.
Slightly more expensive, but similar: for $$577.80, this Lenovo Thinkpad 11e:
https://www3.lenovo.com/us/en/laptops/t ... /customize?
Quad-core Celeron (for $42, upgrade to a quad-core Pentium with 300 MHz higher turbo, and slightly better integrated graphics), Windows 10 Pro, 8 GB of RAM (default is 4, but I upgraded it and included that in the price), 128 GB PCIe NVMe M.2 SSD, 11 inch screen, and 42 Whr battery. The description explicitly says it has milspec durability.
Those two laptops look pretty similar to me. The major difference is that the Dell is slightly cheaper, while the Lenovo is specifically milspec, has the option of a slightly faster processor, and has a PCIe NVMe M.2 SSD instead of SATA. Both have a low-power Celeron (about 6W, whereas a U-series Core processor, which is the next step up in performance, is 15W) and an 11 inch screen (smaller screen = less power consumption), but with very decently sized batteries, so they should get some pretty good battery life.
Also, your employer might have a discount with either Lenovo or Dell, especially if you buy a specifically business-oriented model (Dell Latitude or Lenovo Thinkpad).
If 11 inches is too small, take a look at this: for $539.25, this Lenovo Thinkpad E475:
https://www3.lenovo.com/us/en/laptops/t ... 2TP2TEE475It's only a Thinkpad E-class, which is Lenovo's budget line of Thinkpad. So it's not milspec, but it should still be durable. It does still specifically mention all the durability tests it passes. Dual-core AMD A6 (can be upgraded to a quad-core AMD A10 for $40), Windows 10 Pro (upgrade included in price), 8 GB of RAM (upgrade included in price), 256 GB SATA (upgrade included in price), 14 inch screen, 45 Whr battery.
And this Lenovo E575 is very similar to the aforementioned E475 except it has a 15 inch screen and is slightly more expensive (but just barely). However, the online configurator doesn't offer an SSD, so if interested, I'd call Lenovo sales on the phone. I'm sure they'd be willing to swap the hard drive for an SSD:
https://www3.lenovo.com/us/en/laptops/t ... 2TP2TEE575