If you want compact sports earbuds for workouts and movement, choose Bose SoundSport Free; if you need long battery life and over-ear-style coverage for the library, choose Sony WH-CH520. For quiet study sessions, I’d lean toward Sony: its on-ear design and up to 50 hours of playback suit long stretches away from a charger. Bose is the more natural pick when a secure, sweat-resistant fit matters more than extended listening time.
• Bose SoundSport Free: Truly wireless in-ear earbuds with three sizes of sport tips and IPX4 sweat and weather resistance; the trade-off is up to 5 hours of playback per charge.
• Sony WH-CH520: On-ear headphones with soft earpads, customizable EQ, and up to 50 hours of playback; the trade-off is that they are not the compact, in-ear option for active workouts.
• Choose Bose if you want sports earbuds for library commutes, exercise, or days when you prefer a small in-ear design.
• Choose Sony if your priority is long listening sessions, app-based sound customization, or fewer charging breaks.
• For the library: Sony has the edge for battery endurance; neither model lists noise control, so don’t choose either expecting active noise cancellation.
Bose SoundSport Free is built around movement. These are fully wireless in-ear headphones, with no cable between the earbuds, and the included StayHear-plus Sport tips come in small, medium, and large sizes. That choice of fit is useful if you want to adjust the earbuds for a more secure feel while walking or working out. Their IPX4 rating means they are described as sweat- and weather-resistant, which makes them a more sensible companion for exercise than headphones without that stated protection.
The battery figures are the main limitation to keep in mind. Bose lists up to 5 hours of listening from a charge, with another 10 hours available through the included charging case. That gives you room to recharge between uses, but you’ll need the case for longer days. A full earbud charge takes 2 hours. The Find My Buds feature in the Bose Connect app can help locate earbuds by showing where they were last connected to your phone, and the earbuds can also play an audio signal to help you find them.
How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-19 · 7 min read · Independent comparison
Sony WH-CH520 is an on-ear Bluetooth headphone with soft earpads, an additional head cushion, and a swivel design intended to make the headphones easier to carry. Its lightweight construction is presented as a comfort feature for extended listening, which fits uses such as studying, podcasts, and music at home or on a commute. Unlike the Bose earbuds, it rests on the ears rather than fitting inside them. That makes it a different kind of everyday listening choice, not simply a longer-lasting version of the same design.
Battery life is Sony’s clearest advantage on paper: up to 50 hours of playback. The USB Type-C quick-charge feature is also useful if you forget to charge before heading out; Sony says three minutes of charging can provide up to 90 minutes of playback. Those figures make the WH-CH520 especially practical for long study routines or travel days when a charging opportunity may be inconvenient. The built-in microphone supports hands-free calls, and the headphones can pair with two Bluetooth devices at once.
Sony also gives listeners more control over sound through the Headphones Connect app. You can choose an EQ preset or make and save your own settings. That is a concrete advantage if you want to adjust the sound for different music or listening preferences. The product information lists no noise control, however, so don’t mistake its on-ear construction for noise cancellation. Skip Sony if you need earbuds that stay in place for workouts or want stated sweat and weather resistance.
• Best for a library routine built around long battery life → Sony WH-CH520. Its stated playback time is up to 50 hours, compared with up to 5 hours per Bose charge.
• Best for workouts and sweat resistance → Bose SoundSport Free. It is designed as a sport earbud and has an IPX4 rating.
• Best for choosing a more secure earbud fit → Bose SoundSport Free. Three sizes of sport tips are included.
• Best for shaping the sound through an app → Sony WH-CH520. Its app offers EQ presets and the ability to save custom settings.
• Best for calls without taking out your phone → Sony WH-CH520. It has a built-in microphone for hands-free calling. Bose also supports calls, but its microphone array is in the right earbud and call audio is heard only there.
• Best for finding a misplaced earbud → Bose SoundSport Free. Its app can show where the earbuds were last connected and play an audio signal.
• Best if you switch between two Bluetooth devices → Sony WH-CH520. It can pair with two devices at the same time.
• Best if you want an in-ear, fully wireless sport design → Bose SoundSport Free. Sony is an on-ear headphone with a swivel design for carrying.
My Verdict
Think about fit before focusing on the feature list. Bose sits in the ear and includes three tip sizes, while Sony rests on the ears with soft earpads and an additional head cushion. Those designs feel and behave differently in everyday use, so the right choice depends on whether you prefer in-ear earbuds or on-ear headphones.
Also consider where you expect to use them. Bose’s IPX4 rating and sport-focused fit make it the clearer option for active use. Sony’s long listed battery life and quick charging are more compelling for someone who wants to listen through extended study or travel stretches. The Bose case adds up to 10 hours of playback, but that benefit depends on carrying and using the case.
Neither product lists noise control. If you’re choosing bluetooth headphones for library use because you need to block out nearby conversations, don’t assume either model will do that. The Sony’s on-ear pads and the Bose’s in-ear tips are different physical designs, but the supplied information does not establish that either provides noise cancellation. If noise reduction is essential, check that requirement separately before deciding.
Finally, the Sony app’s EQ controls and the Bose app’s Find My Buds feature solve different problems. Sony gives you more ways to tailor sound; Bose gives you a tool to help locate misplaced earbuds. Think about which benefit you would actually use rather than treating either app as a reason to choose without considering fit, battery, and setting.
For long library sessions, I’d favor the Sony because it lists up to 50 hours of playback and has a quick-charge feature. Neither model lists noise control, so neither should be chosen on the assumption that it will cancel library noise.
Sony lists up to 50 hours of playback. Bose lists up to 5 hours per charge, plus an additional 10 hours through the charging case. Bose’s case helps extend listening, but Sony has the longer stated playback figure.
They are designed for sports and have an IPX4 sweat- and weather-resistance rating. Three sizes of sport tips are included to help you find a secure fit. Their stated 5-hour playback per charge is the main battery trade-off.
Start with fit and use: Bose is an in-ear sport earbud, while Sony is an on-ear headphone with app-based EQ customization. If you’re weighing overall value, check the current price on Amazon and compare it with the features you’ll use most, especially battery life, fit, and workout suitability.
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