# Will a High-Wattage Charger Damage My Phone?

> Using a 100W charger on a phone that only supports 20W is a common worry. Here is what PD negotiation actually does in this scenario.

- Published: 2026-01-19
- Category: Charging
- 6 min read

In a USB Power Delivery system, a charger never forces power a device does not ask for. The moment a connection is made, the charger and device run a digital negotiation; the phone effectively says 'I accept a maximum of 20 watts,' and the charger complies.

This is why using a 100W PD charger with a phone that supports only 20W is completely safe; the phone simply draws what it needs, nothing more is sent. The actual risk comes from uncertified or older-generation chargers that do not support the PD standard properly.

The real danger shows up with low-quality products that fail to implement the PD protocol correctly; some of these try to push a fixed voltage without properly negotiating with the device, which can lead to voltage mismatches and potential damage.

So the practical advice is this: do not shy away from buying a high-wattage PD charger, since it will still be useful for whatever phone or tablet you buy next. What matters is that the charger is genuinely PD-certified and handles the negotiation process correctly.

Charjett's PD-certified chargers run this negotiation fully in line with the standard, delivering a safe charging experience no matter which phone or tablet gets plugged in.

Keywords: charger compatibility, PD negotiation, high-wattage charger, phone charging safety, power delivery

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