Flint Labs sustainability score: 28/100
Below expectations starts at 31. The highest score on SINK is 71.
Flint Labs makes paper-based batteries from cellulose, zinc and manganese, with no lithium, cobalt or nickel. The Singapore company runs a pilot production facility at Cleantech Park and is developing its batteries for electronics and IoT applications as an alternative to conventional lithium-ion cells.
Founded 2025Head office SingaporeWebsite ↗
Flint Labs is a seed-stage battery maker that publishes no emissions data, energy strategy or sustainability targets. Its product design avoids lithium, cobalt and nickel and uses a water-based process, but those benefits are reported from company statements rather than measured. It has no circularity programme or renewable energy commitment, and sustainability accountability rests with the founder.
Flint Labs scores 28/100 (Significant gaps) on SINK's independent climate assessment, scored from public data only. Scores are free. Nobody can pay to change a score, speed it up or hide it. Last verified October 2026.
That places Flint Labs joint 783rd of 1,023 companies scored, and joint 37th of 46 in Electronics / Hardware.
What is Flint Labs doing well, and where does it fall short?
Strongest on Controversies & Red Flags and Nature & Biodiversity Impact (8/10, 5/10). Weakest on Carbon Footprint: Operations and Emissions Trajectory (3/10, 3/10).
Where Flint Labs lost points
For each question that lost points, the evidence our public rubric looks for that we didn't find.
What would raise this score
- Emissions from its own operationsPublish emissions figures for its own operations, even an estimate from energy bills.
- Whether its emissions are fallingShow its emissions are falling, even from energy bills or mileage.
- How clean its energy isMove to a renewable energy tariff or make a major efficiency investment.
Every question that lost points
- Emissions from its own operations3/10No emissions figures for its own operations, not even an estimate from energy bills.
- Emissions from its supply chain4/10Most of its supply-chain (Scope 3) emissions aren't measured.
- Whether its emissions are falling3/10No evidence its emissions are falling, not even from energy bills or mileage.
- How clean its energy is3/10No renewable energy tariff or major efficiency investment shown.
- Its effect on nature5/10Its effect on nature isn't measured or independently verified.
- How it uses materials and handles waste4/10No measurable waste or recycling targets reported publicly.
- Its effect on water4/10No measured water footprint with reduction targets.
- Its climate targets3/10No specific targets with dates.
- How openly it reports4/10No dedicated sustainability role, board oversight or public report.
A score changes when the evidence does. We use new published evidence at the next rescore. Anyone can send us new evidence, free. How to send it.
How is Flint Labs's SINK score calculated?
Same ten questions for every company. No private weighting.
SINK = (0.3 × Base + 0.7 × Performance) × ScaleHas Flint Labs's score changed?
Flint Labs's score has moved from 35 to 28 across 3 recorded reviews, down 7 points.
- 28 → 287 November 2026
Correction, 7 November 2026: removed an unsourced emissions figure; removed a related-company note naming a customer, supplier or partner without a source. Score unchanged.
- 35 → 28-721 October 2026
Initial public score 28 (publish-draft)
- Scored 3519 October 2026
Initial score 35 (score-company publish)
What evidence is Flint Labs's score based on?
13 sources used in this assessment. All publicly available. Each row shows which of the ten questions it informed.
23% of them were published by Flint Labs itself; the rest come from independent sources.
10 of 13 sources are independent of the company.
“Flint's new 8,000-square-foot facility in Singapore integrates pilot-scale production with R&D”
“we're using zinc, manganese and cellulose papers”
“The facility is designed to reduce reliance on traditional battery materials such as lithium, nickel, cobalt, and lead”
“We remove PFAS from our chemistry, we remove cobalt, and we remove the solvent”
“Flint then replaces problematic non-renewables like cobalt and lithium with less environmentally impactful, easily recycled metals”
“users can recycle parts of the batteries or bury them in soil, where they will decompose within six weeks, leaving no harmful residues”
“eliminating toxic materials and supply chain complications”
“We are driven by a vision to combat climate change using innovative, scalable technologies”
“A new paper battery chemistry built with no toxic and scarce elements like lithium, nickel, and cobalt”
“Forbes 30 Under 30 Asia list — Carlo Charles's green venture, Flint, is powering up fast”
“made from 100% recyclable, nontoxic materials that safely decompose”
“Flint employs water-based manufacturing methods, a process engineered not only for scalability but also for enhanced safety and a reduced environmental footprint”
“Changing the world from 8 Cleantech Loop, Singapore 637145”
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How does Flint Labs compare with other electronics / hardware companies?
Where Flint Labs sits among electronics / hardware peers.
Among the 46 major electronics / hardware brands we've scored, Flint Labs is tied =37th of 46, with 2 others.
Who scores higher in Electronics / Hardware?
The 3 companies in the sector scoring nearest above Flint Labs.
Bose publishes its own operational emissions but no Scope 3 figure, which matters most for an electronics maker.
See the breakdown →Xiaomi reports emissions data and circular economy progress but faces critical credibility gaps.
See the breakdown →Which companies moved this week, and why.
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