" compared to other ‘ Job Site ‘ Radios with the same or similar specs " Is it a norm for "other" to have DC in with mains adapter? And no USB power socket?
No Idea. Comes with 9V/1A power supply which means it can't use more than 9W of constant draw. In this case 6x rechargeables like Ikea Ladda should give up to 2.5h on max volume. On medium probably 5-6h
Battery life on them?
Use 6 x 1.5 V type C/Baby/LR14 batteries https://www.lidl-service.com/static/3158081159/313608_EN.pdf
What batteries does it use