Sennheiser just gave me a compelling reason to put away my Bose and Sony headphones for good


Sennheiser Momentum 5 in Denim

Jada Jones/ZDNET

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ZDNET’s key takeaways

  • The Sennheiser Momentum 5 headphones now feature a self-replaceable battery.
  • Most headphones have replaceable earpads, but batteries are less common.
  • As the industry reaches a technological ceiling, self-repair is the next best thing.

Premium headphones might be reaching their ceiling. How much better can noise cancellation and sound quality get? Exactly how many on-device features can a company implement in a device with limited space? 

Review: Sennheiser Momentum 5

While figuring out the answers to these questions, companies are now exploring another front to entice consumers: better power management and battery performance. Last year, Bose’s special trick was the QuietComfort Ultra 2’s Bluetooth Low Energy-enabled power management feature, which effectively rendered the headphones’ power button unnecessary. 

Sennheiser returned this summer with its Momentum 5 headphones, and its special trick is a self-repairable battery, a rarity in consumer headphones — and even rarer in premium consumer models. 

How easy is it to repair the Momentum 5’s battery?

Sennheiser Momentum 5 battery

Jada Jones/ZDNET

The 700 mAh battery is located in the left ear cup, and Sennheiser made it easy to locate and replace yourself. The earpads connect to the cups via grooves — similar to the Bose QuietComfort Ultra 2, rather than magnetic earcups as with the Sonos Ace and AirPods Max 2. 

Once the earpad is removed, you’ll need a precision screwdriver small enough for screws that are about 2.5mm in diameter. Remove the Momentum 5’s four screws, lift the battery housing, and you’ll see the battery.

Also: Sony WH-1000XM6 vs. Sennheiser Momentum 5: I’ve tested both pairs for months, and this one wins

No glue or adhesives keep it in place; instead, there’s a small connector you’ll need to unplug to remove the battery, and subsequently plug the new battery into. Work backward to replace the battery housing and earpad, then you’re good to go. 

Since Sennheiser just released the Momentum 5, spare parts and pricing aren’t yet available. Manufacturers already don’t test over-ear headphones for damage from water or dust ingress, so you should assume they can’t withstand the elements. Over-ear headphones have openings near headband hinges, microphone housings, and wired ports; waterproofing is difficult to execute.

So, with the Momentum 5’s battery being easily accessible and removable, you should really assume that exposure to moisture will damage the headphones. 

An industry unicorn

Sennheiser Momentum 5 in Denim

Jada Jones/ZDNET

Self-repairability in premium consumer headphones generally begins and ends with replaceable ear pads. Though ear pads degrade in structural and hygienic integrity over time, rechargeable lithium-ion batteries also have a life cycle. If you use your headphones nearly every day for five years or so, there’s a high chance their battery won’t last much longer.

By the five-year mark, your headphones are likely four years outside of their warranty period, and a degraded battery from normal wear and tear isn’t a valid manufacturer claim. 

Also: Sony vs. Bose: My buying advice after listening to flagship headphones from both brands

Sennheiser follows a four-year release cadence, a lengthier release schedule than Bose, Sony, and Bowers & Wilkins. By making the Momentum 5’s battery and ear pads self-replaceable, it may make consumers less inclined to upgrade to future generations. 

If your headphones are four years old and you can spend $150 to make them like new, what’s the rush to spend $400+ on newer headphones that can only offer incrementally improved noise cancellation?

I also see the move toward self-repair as Sennheiser buying itself time. The consumer headphones industry needs time to innovate. Sennheiser’s Momentum 5 features the latest consumer audio technologies: Dolby Atmos support at the hardware level, AI-driven adaptive noise cancellation, and modern Bluetooth technologies, such as LE Audio and Auracast, which are coming in a firmware update. 

Also: I traveled 2,700 miles with Sony, Apple, and Sennheiser headphones – this pair sounded the best

As a result, there’s not much left to do — for now. We can look forward to future technologies, such as improved device tracking with Bluetooth Channel Sounding, Wi-Fi-enabled audio chips, advanced AI-powered equalizers, and headphone-compatible biometric sensors.

Until then, Sennheiser wants you to replace your battery yourself and wait for what’s next.





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Global law enforcement operation takes First VPN offline

Pierluigi Paganini
May 21, 2026

Police seized First VPN in a global crackdown, exposed its cybercrime users, and shut down infrastructure tied to ransomware and data theft.

A major international law enforcement operation has taken First VPN offline, a service that had become a quiet staple for ransomware crews, data thieves, and other cybercriminals trying to hide in plain sight.

“The coordinated action took place between 19 and 20 May and targeted the infrastructure behind one of the most widely used VPN services in the cybercrime underground.” reads the press release published by Europol. “The gathered intelligence exposed thousands of users linked to the cybercrime ecosystem and generated operational leads connected to ransomware attacks, fraud schemes, and other serious offences worldwide.”

Authorities seized dozens of servers across 27 countries, arrested the administrator, and carried out a search in Ukraine, cutting off an infrastructure that had been used in a wide range of serious investigations.

The service marketed itself as a privacy-first VPN with no logging and no cooperation with law enforcement, which made it appealing not just to ordinary users but also to threat actors looking to mask their activity. That’s the uncomfortable part of the VPN story: the same tools that help people protect privacy on public Wi-Fi or work securely from home are also useful for criminals who want to conceal their origin, route traffic through different regions, and make attribution harder.

“For years, the service, known as ‘First VPN’, was promoted on Russian-speaking cybercrime forums as a trusted tool for remaining beyond the reach of law enforcement. It offered users anonymous payments, hidden infrastructure, and services designed specifically for criminal use.” continues the press release. “‘First VPN’ had become deeply embedded in the cybercrime ecosystem, appearing in almost every major cybercrime investigation supported by Europol in recent years. Criminals used it to conceal their identities and infrastructure while carrying out ransomware attacks, large-scale fraud, data theft, and other serious offences.”

Europol said the service name kept resurfacing in major cybercrime cases, and Eurojust confirmed that investigators had been building the case for years through a joint effort led by French and Dutch authorities. 

What seems to have made this case especially valuable for investigators is that they didn’t just shut the service down, they also got inside its infrastructure before it disappeared. That likely gave them access to user records, connection data, and other evidence that can be used to map criminal activity back to real people and devices.

Authorities dismantled cybercrime infrastructure, including 33 servers and a service based in Ukraine, and seized domains linked to the operation: 1vpns.com, 1vpns.net, 1vpns.org, plus associated onion sites. They also notified users directly and shared information on hundreds of accounts with international partners, which suggests this may lead to follow-on investigations well beyond the VPN itself.

The bigger lesson is simple: privacy tools are not the problem, but criminal operators often rely on the same infrastructure normal users trust. Once that infrastructure is compromised, dismantled, or logged, the illusion of anonymity can disappear very quickly.

“The operation has already generated significant operational results at Europol’s level:

  • 21 Europol-supported investigations advanced through the intelligence obtained.”
  • 83 intelligence packages disseminated;
  • information linked to 506 users shared internationally;

“For years, cybercriminals saw this VPN service as a gateway to anonymity. They believed it would keep them beyond the reach of law enforcement. This operation proves them wrong. Taking it offline removes a critical layer of protection that criminals depended on to operate, communicate and evade law enforcement.” said Edvardas Šileris, Head of Europol’s European Cybercrime Centre

Follow me on Twitter: @securityaffairs and Facebook and Mastodon

Pierluigi Paganini

(SecurityAffairs – hacking, First VPN)







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