Romoss in the Power Bank Recall Controversy: "Visitors" Surge, Multiple A-share Battery Cell Producers Claim "No Supply"

Due to potential safety hazards in some models of power banks, Shenzhen Romoss Technology Co., Ltd. (hereinafter referred to as "Romoss"), an established power bank company founded in 2012, has found itself at the center of public controversy.

According to an announcement released on June 16 on the official website of the Shenzhen Market Supervision and Administration Bureau, due to the potential combustion risk of some products under extreme scenarios, Shenzhen Romoss Technology Co., Ltd. will recall some mobile power supplies manufactured from June 5, 2023, to July 31, 2024, involving three models: PAC20-272, PAC20-392, and PLT20A-152, totaling 491,745 units. According to product information, the capacity of the three recalled products is 20,000 mAh each.

(Image source: Official website of the Shenzhen Market Supervision and Administration Bureau)

Public information shows that Romoss, founded in 2012, has nine major product lines, including mobile power supplies, outdoor power supplies, data charging cables, and power adapters.

On the afternoon of June 17, one day after the recall announcement was released, a reporter from Caixin Media arrived at the office location indicated on Romoss' official website—Floors 15-18, Tower B, Building 7, Phase III of Shenzhen International Innovation Valley.

The reporter found on-site that Romoss' office was enveloped in the atmosphere of the recall incident: the front desk staff continuously received calls and repeatedly told the callers, "You can contact customer service." Multiple staff members were walking while making calls and repeatedly mentioned keywords such as "recall" and "battery cell."

Regarding the reporter's interview request, the front desk staff of Romoss stated that they had contacted the brand department on behalf of the reporter, but the other party said it was currently inconvenient to accept interviews.

It is worth mentioning that on the afternoon of June 17, the reporter from Caixin Media called the customer service hotline shown in the announcement twice, and the phone prompt said, "The user you dialed has been suspended due to arrears." Two hours later, when the reporter called the hotline again, the prompt changed to, "Sorry, the number you dialed is busy."

In addition, the Romoss Tmall flagship store currently sells a new 2025 model of the PAC20 power bank with a capacity of 20,000 mAh, and the battery type is indicated as lithium polymer battery. When the reporter from Caixin Media tried to inquire about the battery cell of the product with customer service, multiple replies stated that the current "recall issue has led to a surge in inquiries."

According to previous online news, a student claiming to be from a university in Beijing posted, "The school issued a notice: Recently, it was found that the 20,000 mAh Romoss charger is more prone to explosion during charging compared to other brands and models."

In the comment section, multiple netizens also posted screenshots of similar notices, which showed messages like "Received a reminder from the superior competent department" and "Please all faculty and staff promptly check if your power bank is of this brand and model, and it is recommended to discard it immediately to prevent danger."

In response, Romoss issued a statement on Weibo on June 14, stating, "Regarding the recent discussions on the incident of 'multiple universities in Beijing banning Romoss power banks,' we sincerely apologize for the inconvenience caused to teachers, students, and the public. We hereby solemnly promise that we will assume full responsibility for any Romoss products identified as defective by authoritative institutions in accordance with the law. Meanwhile, we attach great importance to this matter and have initiated an immediate investigation. We have communicated with relevant departments, including the Beijing Municipal Commission of Education. As of the release of this statement, we have not received any risk notifications from the Beijing Municipal Commission of Education. There have been deviations in the dissemination of relevant information, leading to public misunderstandings. We will keep everyone informed of the subsequent developments of this incident through official channels as soon as possible."

On June 17, a reporter from Cailian Press interviewed several teachers and students from the Capital University of Economics and Business, Beijing Union University, and Beijing University of Civil Engineering and Architecture, all of whom stated that they had not noticed the school issuing such a notice.

The reporter learned from the interviews that factors such as overcharging, internal short circuits, and poor heat dissipation could potentially lead to bulging or explosion of power banks.

Zhang Xiang, Secretary General of the International Intelligent Transport Technology Association and a visiting professor at Huanghe Science & Technology College, told a reporter from Cailian Press that overheating during the use of power banks could cause the product to expand and deform, leading to misalignment of the internal structures such as the positive and negative electrode separators and electrolyte within the battery due to compression. In addition, after prolonged use of power banks, lithium batteries are prone to developing dendritic crystals—lithium dendrites—which can puncture the battery separator. These situations can easily trigger short circuits and lead to explosions.

According to information from the website of the Shenzhen Market Supervision and Administration Bureau, the mobile power supply products recalled by Romoss may experience overheating during use in a very small number of cases due to the raw materials of some battery cells, posing a combustion risk under extreme scenarios and presenting safety hazards.

Regarding battery cell manufacturers, when asked whether they were involved in supplying products to Romoss, a representative from Sunwoda (300207.SZ) told the reporter, "They did not use our battery cells." A representative from the securities department of Desay Battery (000049.SZ) said, "I don't think so." The securities department of EVE (300014.SZ) stated, "We have not seen any relevant news. Everything is subject to the announcement. We are not really clear about this."

"The safety and reliability of power banks can be further enhanced by increasing the functionality of the battery management system and improving the distribution of sensors," Zhang Xiang said. Typically, the explosion of a battery is a cumulative process, and battery safety is basically maintained through detection by relevant sensors. The sensor system measures whether the temperature, current, and voltage of the power bank are within the safe thresholds. If any abnormalities are detected, an alert is issued, which can significantly reduce the likelihood of battery explosion.