LithiumHub v. Shenzhen Yichen S-Power: LiFePO4 Battery Patent Case Dismissed Without Prejudice
LithiumHub, LLC and LithiumHub Technologies, LLC brought a patent infringement action in the Eastern District of Texas against Shenzhen Yichen S-Power Tech Co., Ltd., asserting two patents covering LiFePO4 deep cycle battery technology across eleven Dakota Lithium-branded products. The case closed after 410 days when plaintiffs filed a voluntary notice of dismissal without prejudice before the defendant had answered.
LiFePO4 Battery Patent Suit Dropped Before Defendant Could Respond
LithiumHub, LLC and LithiumHub Technologies, LLC filed suit on September 13, 2024 in the Eastern District of Texas (Case No. 5:24-cv-00137) before Judge Robert W. Schroeder III, asserting infringement of US9954207B2 and US9412994B2 against Shenzhen Yichen S-Power Tech Co., Ltd., a Shenzhen-based battery manufacturer. The accused products included eleven Dakota Lithium-branded LiFePO4 deep cycle batteries ranging from 12V 7Ah configurations to high-voltage 72V and 48V systems used in applications from ice fishing to golf carts and trolling motors.
The case ended on October 28, 2025, when plaintiffs filed a Notice of Dismissal Without Prejudice pursuant to Federal Rule of Civil Procedure 41(a)(1)(A)(i). Because Shenzhen Yichen S-Power had not yet filed an answer or a motion for summary judgment, the court accepted the notice as of right and ordered all claims dismissed without prejudice. Any pending motions were denied as moot. Critically, dismissal without prejudice means LithiumHub retains the legal right to refile the same claims against the same defendant.
The 410-day duration before a pre-answer dismissal is notable: it suggests the case may have been used as leverage in licensing negotiations, or that plaintiffs reassessed litigation strategy after filing — a pattern consistent with actions against Chinese manufacturers where service of process and jurisdictional complications can extend timelines significantly. The public record does not disclose whether any settlement agreement or licensing arrangement was reached. The absence of any defendant counsel on record suggests Shenzhen Yichen S-Power may never formally appeared in the proceedings.
Filing to Dismissed without Prejudice in 410 days
410 days from filing to closure — resolved before defendant filed any responsive pleading
Dismissed without prejudice: what the Rule 41 exit means for both parties
Rule 41(a)(1)(A)(i): a dismissal as of right, not a court decision
Under Federal Rule of Civil Procedure 41(a)(1)(A)(i), a plaintiff may dismiss an action without a court order at any time before the defendant serves an answer or a motion for summary judgment. Here, because Shenzhen Yichen S-Power never filed a responsive pleading, LithiumHub was entitled to dismiss unilaterally. The court’s role was purely ministerial — it accepted the notice and ordered the dismissal. No merits ruling was issued.
No merits adjudicationLithiumHub keeps its legal options open — for now
Dismissal without prejudice preserves LithiumHub’s right to refile the same infringement claims against Shenzhen Yichen S-Power. The patents US9954207B2 and US9412994B2 remain in force and were not challenged or invalidated in this proceeding. LithiumHub may pursue the same defendant in a future action, approach different distributors of the accused products, or use the filing as negotiating leverage. The dismissal does not constitute any admission of weakness in the underlying patent claims.
Right to refile preservedShenzhen Yichen S-Power escapes this action — but cloud remains
With no merits ruling and no finding of non-infringement, Shenzhen Yichen S-Power cannot treat this dismissal as a legal clearance. The two asserted patents remain valid and enforceable. If the defendant continues selling the accused LiFePO4 products into the US market, it remains exposed to a refiled infringement action. The absence of any defendant counsel on record suggests the company may not have engaged fully with US litigation risk — a posture that could prove costly if LithiumHub refiles.
Infringement cloud persistsLiFePO4 importers face ongoing enforcement risk from this patent family
This case signals that LithiumHub is actively monitoring and enforcing its LiFePO4 battery patent portfolio against Chinese manufacturers selling into the US market. Other importers and distributors of similarly configured deep cycle batteries — particularly those with integrated BMS, USB ports, or voltmeters matching the patent claims — should treat this action as an indicator of broader enforcement intent. The Eastern District of Texas remains a favored venue for such actions, and a without-prejudice dismissal typically signals an ongoing commercial dispute rather than a concluded one.
Active enforcement signalFull party and counsel information
| Role | Name | Type | Detail |
|---|---|---|---|
| Plaintiff | LithiumHub, LLC | Company | LiFePO4 battery IP licensing entity — holder of US9954207B2 and US9412994B2Search in Eureka ↗ |
| Co-Plaintiff | LithiumHub Technologies, LLC | Company | Search in Eureka ↗ |
| Defendant | Shenzhen Yichen S-Power Tech Co., Ltd. | Company | Shenzhen-based LiFePO4 battery manufacturer selling Dakota Lithium-branded productsSearch in Eureka ↗ |
| Plaintiff counsel | Geoffrey Patton Culbertson | Attorney | Counsel for LithiumHub, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Helen Yu Zhang | Attorney | Counsel for LithiumHub, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Kelly B. Tidwell | Attorney | Counsel for LithiumHub, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Nicole Sara Cunningham | Attorney | Counsel for LithiumHub, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Scott A Cole | Attorney | Counsel for LithiumHub, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Steven Arthur Moore | Attorney | Counsel for LithiumHub, LLCSearch in Eureka ↗ |
| Plaintiff counsel | Tim F. Williams | Attorney | Counsel for LithiumHub, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Dority & Manning PA | Law Firm | Representing LithiumHub, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Patton Tidwell & Culbertson LLP | Law Firm | Representing LithiumHub, LLCSearch in Eureka ↗ |
| Plaintiff law firm | Patton Tidwell & Culbertson LLP (Texarkana) | Law Firm | Representing LithiumHub, LLCSearch in Eureka ↗ |
| Presiding judge | Judge Robert W. Schroeder, III | Judge | Texas Eastern District CourtSearch in Eureka ↗ |
Official order — verbatim text
The court’s order tracks the ministerial language of Rule 41(a)(1)(A)(i) precisely: because Shenzhen Yichen S-Power had neither answered nor moved for summary judgment, no court approval was required and no discretion was exercised. The phrase ‘DISMISSED WITHOUT PREJUDICE’ carries its full procedural weight — LithiumHub’s infringement claims against this defendant are terminated for now, but the cause of action survives intact. The denial of pending motions ‘as moot’ confirms no substantive rulings were made on claim construction, validity, or infringement. Both patents remain unchallenged.
US9954207B2 & US9412994B2 — LiFePO4 Deep Cycle Battery Systems
US9954207B2 (application US14/657101) and US9412994B2 (application US13/989273) together cover aspects of lithium iron phosphate (LiFePO4) deep cycle battery technology, including integrated battery management systems (BMS), multi-voltage configurations, and associated charging and output circuitry. LiFePO4 chemistry is distinguished from other lithium-ion variants by its thermal stability, cycle longevity — the accused products claim 2,000+ cycles — and suitability for deep discharge applications in marine, recreational, and off-grid power contexts.
These patents are strategically significant in a market undergoing rapid transition from sealed lead-acid (SLA) batteries to lithium alternatives. The accused product range — spanning 12V consumer cells to 72V electric vehicle packs — suggests broad claim scope that, if upheld, could constrain a large segment of the LiFePO4 import market. For competitors developing BMS-integrated LiFePO4 products targeting US recreational, marine, or solar storage markets, freedom-to-operate clearance against this patent family is a commercially important step before product launch or distribution expansion.
Should your LiFePO4 battery product be cleared against US9954207B2 and US9412994B2?
Any company manufacturing, importing, or distributing LiFePO4 deep cycle batteries with integrated BMS, multi-voltage outputs, USB charging ports, or voltmeters for US sale should assess exposure against these two patents. The accused product range in this case — from compact 12V 7Ah cells to 72V 55Ah EV packs — signals broad claim application across recreational, marine, solar storage, and light electric vehicle markets. Retailers sourcing private-label or OEM LiFePO4 batteries from Chinese manufacturers are particularly exposed.
PatSnap Eureka’s FTO Search Agent can map the claim boundaries of US9954207B2 and US9412994B2 against your specific product architecture, flag overlapping prior art that could support an IPR petition, and identify design-around opportunities in battery management circuit topology or cell configuration. Run a targeted FTO analysis before entering or expanding in the US LiFePO4 market to avoid inheriting the litigation risk this case has put on record.
Run a freedom-to-operate analysis on US9954207B2 to assess your product’s exposure
Run FTO in Eureka →Similar LiFePO4 Battery Patent Infringement Cases in E.D. Texas
Related patent infringement actions involving LiFePO4 battery technology and BMS-integrated deep cycle battery systems filed in the Eastern District of Texas.
What this case signals for the LiFePO4 battery IP landscape
A pre-answer voluntary dismissal in E.D. Texas often marks a strategic pause, not an exit — especially when Chinese manufacturers are involved.
Pre-answer dismissals against Chinese defendants often signal licensing pressure
When a US plaintiff dismisses without prejudice before a Chinese defendant has answered, it frequently suggests parallel settlement or licensing discussions rather than a decision to abandon the case. The 410-day duration before dismissal — well beyond typical administrative delays — is consistent with extended out-of-court negotiations. Companies in the LiFePO4 supply chain should monitor whether LithiumHub refiles or grants licenses.
Both patents survive: US9954207B2 and US9412994B2 remain enforceable
No IPR was filed, no invalidity challenge was adjudicated, and no court found either patent unenforceable. Competitors and distributors of LiFePO4 deep cycle batteries with integrated BMS, multi-voltage configurations, or dual USB outputs should conduct freedom-to-operate analysis against this patent family before expanding US sales. The patents’ continued validity poses a real barrier to market entry.
LithiumHub v Shenzhen — key questions answered
The case was dismissed without prejudice on October 28, 2025. LithiumHub and LithiumHub Technologies filed a voluntary notice of dismissal under Rule 41(a)(1)(A)(i) before the defendant had filed an answer or motion for summary judgment. No merits ruling was issued. The two asserted patents, US9954207B2 and US9412994B2, remain in force and enforceable.
LithiumHub asserted US9954207B2 (application US14/657101) and US9412994B2 (application US13/989273), both covering LiFePO4 deep cycle battery technology including integrated battery management systems and multi-voltage configurations. The patents were not challenged or invalidated during the proceedings.
Yes. A dismissal without prejudice under Rule 41(a)(1)(A)(i) preserves the plaintiff’s right to refile the same claims. LithiumHub’s infringement claims against Shenzhen Yichen S-Power were not adjudicated on the merits, and the company may initiate a new action in the future asserting the same patents against the same defendant or related parties.
Eleven Dakota Lithium-branded LiFePO4 deep cycle battery products were accused, ranging from 12V 7Ah compact cells to 48V 96Ah golf cart batteries and 72V 55Ah electric vehicle packs. Common features across accused SKUs include integrated BMS, 2,000+ cycle ratings, multi-voltage configurations, and outputs including USB ports and voltmeters.
The public record does not disclose the reason. Possible explanations include: the parties reached a private licensing or settlement agreement; plaintiffs reassessed the strength of their infringement case; service of process on the Chinese defendant proved difficult; or the filing served as commercial leverage. The 410-day duration before dismissal suggests the case was not abandoned quickly, and the without-prejudice nature signals ongoing optionality for LithiumHub.
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