Not my daily driver (yet?), but made a custom dumbphone by getting a Nokia 3310 without a battery or charger and implanting a 2500 mAh Li-Ion cell and a USB-C port (details
Amazon.com: DDONG Replacement Battery BL-4UL for Nokia 3310 TA-1036, 225 RM-1011 RM-1126 RM-1012 Battery : Cell Phones & Accessories
Why I Might Ditch My Smartphone for the Nokia 3310 - Bloomberg
Nokia 3310 - 2017 Reviews, Pros and Cons | TechSpot
Nokia 3310 review: Meet your new "festival phone" | British GQ | British GQ
The new Nokia 3310 battery life is 31 days!
Nokia 3310 (2017) - Wikipedia
The new Nokia 3310 battery life is 31 days!
Best battery life phone 2022: iPhone and Android models | The Independent