Flint Labs makes paper-based batteries from cellulose, zinc and manganese, with no lithium, cobalt or nickel.
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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. Fees pay for the review, never the result. Last verified October 2026.
That places Flint Labs joint 658th of 847 companies scored, and joint 27th of 33 in Electronics / Hardware.
Where Flint Labs sits among electronics / hardware peers.
Among the 33 major electronics / hardware brands we've scored, Flint Labs is tied =27th of 33, with 2 others.
Its three lowest-scoring questions, and what the evidence didn't show.
No emissions data published or filed with Singapore's mandatory registries.
No historical emissions dataset exists.
No renewable energy tariff, on-site solar, or energy sourcing disclosure found.
A score changes when the evidence does. We use new published evidence at the next rescore. Evidence that isn't public can count through an evidence review.
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Get in touch →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).
The 3 companies in the sector scoring nearest above Flint Labs.
NVIDIA's reported Scope 3 nearly tripled in two years, from 3.6 Mt in FY2024 to 10.7 Mt in FY2026, and it does not report the use-phase emissions of the GPUs it sells, which Greenpeace estimates at up to 21 Mt in 2025.
See the breakdown →Xiaomi reports emissions data and circular economy progress but faces critical credibility gaps.
See the breakdown →Flint Labs's score has moved from 35 to 28 across 2 recorded reviews, down 7 points.
Initial public score 28 (publish-draft)
Initial score 35 (score-company publish)
The formula and all 13 sources.
Same ten questions for every company. No private weighting.
SINK = (0.3 × Base + 0.7 × Performance) × Scale13 sources used in this assessment. All publicly available. Each row shows which of the ten questions it informed.
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”
If you believe a source has been misread or a newer version exists, submit a challenge.
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.
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