---
title: "vivo X300 Pro 90W FlashCharge Test and Charging Speeds"
canonical: "https://x300profieldnotes.com/90w-flashcharge/"
description: "A detailed breakdown of the 90W FlashCharge technology on the vivo X300 Pro, including 0-100% times and thermal performance."
---

# vivo X300 Pro 90W FlashCharge: Real-World Speed Test

> A detailed breakdown of the 90W FlashCharge technology on the vivo X300 Pro, including 0-100% times and thermal performance.

The massive [6,510 mAh Silicon-Carbon battery](/battery/) on the [vivo X300 Pro](/vivo-x300-pro-review/) is only half the story. The other half is how quickly you can refill it. The phone supports **90W wired FlashCharge**, which uses vivo's proprietary charging protocol to deliver massive amounts of power while managing heat efficiently.

Here is my real-world testing data on the 90W FlashCharge system.

## 0 to 100% Charging Test

I ran this test starting from a completely dead phone (0%) using the official 90W charger and cable included in the box. The phone was turned on immediately after plugging it in, connected to Wi-Fi, and sitting at room temperature (around 22°C / 72°F).

- **5 Minutes:** 18%
- **15 Minutes:** 44%
- **30 Minutes:** 78%
- **42 Minutes:** 100% (Full)

Considering the battery is an absolute unit at 6,510 mAh, filling it completely in roughly 42 minutes is mind-blowing. A quick 15-minute splash-and-dash before leaving the house easily gives me enough juice to last an entire evening of heavy [camera use](/camera/).

## Thermals During Charging

Heat degrades batteries over time, so how hot does the X300 Pro get at 90W? 
During my tests, the phone peaked at **39.5°C (103°F)** around the 20-minute mark, right when it was pulling maximum wattage. 

Once it hit 80%, the charging speed throttled down significantly (a standard practice to protect battery health), and the phone cooled back down to room temperature for the final 20% trickle charge. The thermal management is excellent, partly thanks to the [Dimensity 9500's efficient heat dissipation](/performance/).

## Compatibility with Third-Party Chargers

The 90W speed is **strictly proprietary**, detailed in our full [hardware specifications](/specifications/). You must use a vivo FlashCharge-compatible brick and cable to get those speeds.

If you plug the vivo X300 Pro into a standard USB Power Delivery (USB-PD) charger (like a MacBook charger or an Anker GaN brick), it defaults to a much slower standard PD rate—typically around **18W to 27W**. 

**Pro Tip:** If you travel frequently, bring the official vivo brick. Charging a 6,510 mAh battery at 18W on a standard PD charger takes well over 2 hours!

Wireless charging performance, daily endurance logs, and compatible cables are documented in our [40W Wireless Charging Guide](/40w-wireless-charging/), [Battery Endurance Review](/battery/), and [Accessories Guide](/accessories/).