1515
All the other brands went along
(slrpnk.net)
This is a most excellent place for technology news and articles.
Oh sweet child. What has Apple done to people? A removable battery looks like this:
https://www.ifixit.com/products/lenovo-thinkpad-x220-x220i-x230i-replacement-battery
You just snap it onto the computer. No disassembly. No tools. No screws. All laptops and cell phones except Apple used to have them. You could carry several charged batteries with you and swap them as needed. Some laptops even used two, so you could hot swap with no power interruption.
And we walked to school barefoot, in the snow, uphill both ways. :)