U.S. Battery Listed by pear Ransomware Group: Ransomware Claim — What’s Alleged & What To Do

Ransomware groups continue to target manufacturers and industrial suppliers as part of a broader pattern of double-extortion attacks, in which data is stolen before systems are encrypted and victims are threatened with public release. Against that backdrop, U.S. Battery appeared on a ransomware leak site in mid-2025, adding another established American manufacturer to the list of claimed victims.

Public reporting on 21 July 2025 stated that the ransomware group known as pear had listed U.S. Battery and claimed to have exfiltrated internal files. The number of people affected remains unknown, and further technical details have not been released. The incident matters because even limited internal material from a long-standing battery maker can contain operational, commercial or personal information that adversaries can reuse.

Breaking down the breach

According to the available record, U.S. Battery was listed by the pear ransomware group on or around 21 July 2025. The group asserted that internal files had been exfiltrated during a ransomware attack. No confirmed figure for the volume of data, no list of specific file types beyond the general description “internal files,” and no public statement on whether encryption also occurred have been disclosed. The number of individuals whose information may have been involved is likewise unknown. Public detail is therefore limited to the fact of the listing and the claim of exfiltration; independent verification of the group’s assertions has not been reported.

Inside pear

Pear operates as a ransomware group that follows the now-common double-extortion model: data is stolen, systems may be encrypted, and the victim is threatened with publication on a dedicated leak site if payment is not made. Like other groups in this category, pear publicises claimed victims to increase pressure and to advertise its activity. The listing of U.S. Battery is therefore a claim made by the group itself; it does not by itself confirm the full scope or success of any intrusion. Public knowledge of pear’s earlier campaigns is limited to the same pattern of leak-site postings and demands for payment, without unique technical signatures that have been widely documented in open sources.

U.S. Battery and its sector

U.S. Battery has designed and manufactured deep-cycle batteries since 1926. Companies of this type supply batteries for industrial, recreational, renewable-energy and motive-power applications. They typically maintain engineering drawings, supplier contracts, customer order histories, employee records, quality-control data and proprietary process information. A breach at such an organisation is consequential because the sector sits at the intersection of manufacturing, logistics and energy storage; disruption or data exposure can affect supply chains, competitive positioning and the privacy of employees and business partners.

What was likely exposed

The only data type named in the public record is “internal files” said to have been exfiltrated. Exact contents remain unconfirmed. Organisations that design and manufacture specialised batteries commonly hold engineering specifications, production schedules, customer and supplier contact lists, financial records, and human-resources files. Whether any of those categories were among the files claimed by pear has not been independently verified, and the number of people potentially affected is unknown. Readers should therefore treat any more detailed description of the stolen material as speculative until further disclosure occurs.

Why it matters

For individuals whose personal or work-related information may have been present, the practical risks include targeted phishing, identity fraud and social-engineering attempts that reference genuine internal details. For the company, exposure of internal files can reveal pricing, product designs or operational weaknesses that competitors or other threat actors could exploit. Even when the precise contents stay undisclosed, the mere fact of a ransomware listing can erode customer and partner confidence and impose remediation costs. Because the scale of the incident is unknown, the full extent of these risks cannot yet be quantified.

If your data was in this claimed breach

If you have ever worked for, supplied or purchased from U.S. Battery, treat the possibility of exposure seriously even though the exact data set is unconfirmed. Monitor financial and credit accounts for unusual activity, enable multi-factor authentication on email and other critical services, and be alert to unsolicited messages that appear to reference company business. Change passwords that may have been reused across work and personal accounts. Readers can also run a free exposure scan of their email address to check whether that address has already appeared in known breach data sets; doing so provides an additional, independent signal of past compromise.

AICompiled with AI assistance from public sources and published under our editorial standards.