I recommend the 15.6" ThinkPad L560 that starts at $559 with a Core i3-6100. Selecting the i5-6200u for $50 only increases the price to $594 so there is a 30% discount working in the background.
http
/shop.lenovo.com/us/en/laptops/thinkpad/l-series/l560/
However, there are two limitations to consider:
- Only 4GB of RAM, opting for another stick of 4GB of RAM increases the price to $627. Or another $32. That is actually a good price. It works out to be a little less expensive compared to buying your own 4GB of RAM and installing it yourself.
- It only has a 1366x768 resolution screen. The option for a 1080p screen is $120. However, the actual price increase is only $84. That brings the price up to $710 assuming you selected the additional 4GB RAM stick as well. However, most laptops in your price range only has a 1366x768 resolution screen anyway.
The picture below highlights the latches for the removable battery.