There is also USB Power Delivery (USB-PD) a manufacturer-independent open standard that Apple and Google in particular rely on. The advantage: Power supplies and cables from many different manufacturers are compatible.
SuperVOOC from Oppo and OnePlus goes one step further. What was previously known as “Warp Charge” has been referred to under this name since the two brands merged. The current OnePlus 15 fully charges the 7,300 mAh battery with 120 watt SuperVOOC in just 40 minutes. If you don’t have a SuperVOOC power supply at hand, you can also charge via USB-PD, but then only with a maximum of 55 watts.
How manufacturers protect their batteries
The fact that fast charging is so harmless to the battery is no coincidence, but the result of targeted protective measures. Manufacturers are aware of the heat problem and have developed a number of technologies over the years that ensure that as little heat as possible is generated during charging or at least is dissipated quickly.
Power supplies with integrated power management: Modern fast-charging power supplies are no longer simple electricity suppliers. Built-in circuits actively monitor the charging process and ensure that excess heat escapes from the power supply before it comes near the battery. The disadvantage: These adapters are often slightly larger and heavier than normal chargers.
Paralleles Laden: Instead of passing the entire current through a single battery cell, it is divided between two cells connected in parallel. This halves the heat generated per cell and makes higher overall performance possible. Many manufacturers are now combining this approach with optimized power supplies to get the best of both methods.
Cooling hardware: The better a device can dissipate heat, the more current can safely flow into the battery. Manufacturers rely on heat shields, steam chambers or even active ventilation systems. Steam chambers have been found in many Android devices for years, for example in the new Samsung Galaxy S26 (since the S23) or in the gaming smartphones from the Asus ROG Phone series.
Apple followed suit for the first time in September 2025 with the iPhone 17 Pro and Pro Max: Since then, both models have also used a steam chamber that dissipates heat from the chip and thus maintains the device’s performance even under load.
Our conclusion: Does fast charging ruin the cell phone battery or not?
The short answer: no – at least not significantly more than slow loading. The long-term test by HTX Studio showed after 500 charging cycles that the difference between 120 watts and 18 watts is in the single-digit percentage range and is hardly noticeable in everyday life.
The users themselves actually have the greatest influence on battery life. Here are the ones most important quick tips, How to keep your cell phone battery running for longer and, in the worst case scenario, even avoid fires:
- Avoid complete discharges. The optimal battery level is in the range of 20 to 80 percent.
- Do not charge your battery if it is still relatively full (above 60 percent).
- Avoid extreme temperature fluctuations, whether hot or cold.
- Always use the charging accessories provided by the manufacturer (power adapter, charging cable).
- Do not charge your phone when running powerful apps or games.
- Do not leave your phone plugged in longer than necessary when the battery is fully charged. By the way, Android offers a practical function for this.
(PC-Welt)
