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BatteryFolio

The battery and storage industry, read through primary sources. Every story is grounded in a primary document — an SEC filing or a patent record — never a press release. Disclosure or it didn't happen.

24Articles indexed
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SEC · IPFilings & patents

Latest Articles

24 articles indexed

Energy Storage

Suppression priced per cell instead of per pack

Moving the extinguishing agent inside the cell wall multiplies its cost by the cell count. A published application does exactly that, and the filing discloses none of the numbers that would tell you whether it pencils.

By Jonah Okafor · Jul 23, 2026 · Patent record

Energy Storage

LG Energy Solution Files on a Coating That Shuts Current Off

A published application claims a two-ingredient electrode protective layer that stops conducting between 70 and 130 degrees C. It is the outlier in a same-day batch otherwise dominated by pack hardware.

By Eli Fontaine · Jul 21, 2026 · Patent record

Energy Storage

CATL Files a Process Answer to a Sodium-Cell Water Problem

A published application from Contemporary Amperex describes charging a sodium cell in a voltage window that electrolyzes leftover water into hydrogen before sodium can plate. The filing sits on the process line, not in the chemistry lab — and that is the part worth reading.

By Eli Fontaine · Jul 16, 2026 · Patent record

Energy Storage

Fluence's July Patent Drop Leans on Software, Not Cells

Five of nine newly published Fluence applications describe fleet diagnostics, state-of-health estimation, and maintenance optimization — the recurring, after-the-sale layer of the storage business.

By Eli Fontaine · Jul 2, 2026 · Patent record

Energy Storage

A Cylindrical-Cell Grant Wave Points to Where the Cell Line Is Heading

Nineteen battery grants issued to one cell maker on June 30 cluster around large-format cylindrical cells and the machinery to build and screen them — a signal about the commercial roadmap, read from the record.

By Jonah Okafor · Jun 30, 2026 · Patent record

Energy Storage

What Is the 'Use of Proceeds' Section in an S-1?

The use-of-proceeds disclosure tells investors what a company intends to do with the money it raises. Here is what SEC rules require it to state.

By Renata Cho · Jun 22, 2026 · SEC

Energy Storage

Tolling Agreement vs PPA for Energy Storage, Explained

A tolling agreement pays the owner for the right to dispatch a battery; a PPA buys the electricity produced. Here is how the two structures appear in real SEC filings.

By Jonah Okafor · Jun 22, 2026 · SEC

Energy Storage

What Is Tax-Equity Project Finance for Battery Storage?

Tax-equity financing lets a project monetize federal energy credits by bringing in an investor that can use them. Here is how the structure appears in a real SEC exhibit.

By Renata Cho · Jun 22, 2026 · SEC

Energy Storage

What Is a Going Concern Qualification in an SEC Filing?

A going-concern qualification is an auditor's flag that there is substantial doubt about a company's ability to keep operating. Here is what it means and how it reads in a real filing.

By Renata Cho · Jun 22, 2026 · SEC

Energy

NextNRG Swaps a $100,360 Insider Note for Stock — Read the 8-K

NextNRG (NXXT) filed an 8-K disclosing a Stock Purchase Agreement under which CEO and Executive Chairman Michael Farkas took 260,000 shares in exchange for cancelling a March 2024 promissory note, and the note was terminated the same day.

By Renata Cho · Jun 18, 2026 · SEC filing

Energy

Toyota's Latest Applications Point Toward Low-Cost Manganese-Phosphate Cathodes

Two of the automaker's U.S. patent applications published this week claim lithium-manganese-iron-phosphate and doped lithium-manganese-phosphate cathode materials — an ~18-month-old signal that Toyota's battery R&D is reaching into the lower-cost LFP-family chemistry, not only the solid-state work it is known for.

By Sloane Whitaker · Mar 20, 2026 · Patent record