Checking an open-box charger or adapter is safe and genuine
Markings, weight, port feel and a first-charge test — how to confirm a fast charger is what it claims before you trust a phone to it.
5 min readDifficulty: EasyUpdated 2026-09-25
A charger is the one accessory that can damage the device plugged into it, so it is worth five minutes of checking even on a sealed unit — and an open-box one is no different.
Everything here is visible without opening anything.
What you’ll need
- The adapter and its cable
- A phone that reports charging speed
- The listing’s stated wattage
Step by step
- 1
Read the printed rating
Output voltage and amperage should be printed on the body and should match the listing. A fast charger that claims 65W and prints 5V/2A is not a fast charger.
- 2
Check the compliance markings
Look for the BIS mark for India, alongside the manufacturer name and a model number. Absent or smudged markings are the clearest sign of a counterfeit.
- 3
Weigh it in your hand
Real GaN and high-wattage adapters are dense. A 65W adapter that feels hollow almost certainly is.
- 4
Check the port and pin feel
Pins should be rigid and evenly spaced; the USB port should grip the cable without wobble. Play in either is a mechanical fault worth reporting.
- 5
Test the actual charge rate once
Plug in a phone that reports charging speed and confirm it negotiates the fast-charge rate. A genuine adapter reaching only trickle speed has a fault.
Common questions
- The adapter gets hot. Should I worry?
- Warm is expected at high output. If it is uncomfortable to hold, smells of hot plastic, or the casing deforms, stop using it immediately and report it.
- Can I use it with a different brand of phone?
- USB-C PD is a standard, so yes for the PD profiles. Proprietary fast-charging above that usually falls back to a slower standard rate, which is safe.
- The cable was not included. Is that normal?
- For some units, yes — and the listing says so. It is often the reason one adapter is cheaper than an identical one.