Razer has launched the Phone Cooler Chroma, a device intended to help keep smartphones from throttling during games. The new device is available for both iPhone and Android with the iPhone model supporting MagSafe while the Android model uses a traditional clamp.
https://www.notebookcheck.net/Razer-Phone-Cooler-Chroma-with-MagSafe-launched-for-iPhone-non-MagSafe-model-for-Android-too.583624.0.html