Consumer services

Doblet

Website

Doblet is the world’s first network of batteries on demand for charging phones everywhere. The company’s mission is to provide portable power anywhere consumers happen to be. Using patent-pending technology and the Doblet mobile app on iOS or Android devices, users are instantly notified of the nearest place to pick up a charge the moment their bat

Overview

Doblet is the world’s first network of batteries on demand for charging phones everywhere. The company’s mission is to provide portable power anywhere consumers happen to be. Using patent-pending technology and the Doblet mobile app on iOS or Android devices, users are instantly notified of the nearest place to pick up a charge the moment their batteries start to run low. Consumers can charge their smartphones while on the go at over 1,000 San Francisco Bay Area cafes, bars, and restaurants.

Company description As recorded 2026-11-08
Consumer servicesHardware deviceConsumersConsumerTransaction fee

Founders & team

Jeff Chang

Founder/CTO

Co-founder and CPO, Rad AI; former co-founder of Doblet (YC S14). Rad AI uses generative AI to provide operational savings for radiology practices and health systems, reducing radiologist fatigue and burnout, and improving the quality of patient care. ER radiologist, fellowship-trained in musculoskeletal MRI. Started college at age 13, med school at NYU at age 16, second-youngest doctor on record in the US. Prior graduate studies in machine learning at U. Edinburgh, and angel investor.

Founder profile As recorded 2026-09-15
2team members reported
Source-reported As recorded 2026-09-15

News & product activity

Sources & observations

Y Combinator

Profile depthverified profile
Website observationwebsite reachable
Last website check2026-11-11
Location · source statedSan Francisco, CA, USA
Pricing evidenceNo pricing page confirmed
Maturity: Not assessed · 3 of 6 areas documented

Source-based assessment · automated evidence rules

The source reports an inactive or acquired company; current product identity needs review.

Maturity is an evidence-based assessment, not a success rating. It may understate the current stage where evidence is limited. Coverage records documented areas, not a complete or independently audited company history.

Stage definitions
independent websitesource corroborationreachable websitedescriptive evidenceclassified market and modelsourced people
startup.observe Directory coverage · Sources & method