Good point HOK.
I think that if that lantern was used as a phone charger @ one amp, each cell would be approximately equal to a 18650. They'd be 4Sx2P setup, so each P set would pull half duty, keeping the demand low enough to equate them to the 18650. It is at the higher demands, (greater than one amp) that the LiIon outperforms the D cells (by double or triple).
My Ryobi 18V One+ bluetooth speaker has a USB output, and the larger battery has 8 18650 cells in it. One thing about battery powered tools is that they charge up pretty quickly.
During an outage a member here was able to bring a charger and cells to the public library where for a limited amount of time, he was permitted to use an electric outlet. My 3 cell power banks may take 6 hours to charge, but my 4 cell tool battery less than an hour. I think on my Father's Day shopping list will be a 12V car charger for my Ryobi tool batteries.