The 'Adapter' Gap: Why Your 15W Wireless Charger is Actually a 5W Paperweight
You decide to gift a premium Bamboo Wireless Charger. The spec sheet says "15W Fast Charging." It sounds impressive. You buy 500 units.
A week later, the complaints roll in. "It charges so slowly." "It takes 4 hours to charge my phone." "It's broken."
The charger isn't broken. The problem is the Power Source. Most wireless chargers are sold as "Pad Only" (cable included, wall adapter excluded) to save cost and packaging waste. This means the user plugs the cable into whatever USB port they have handy.
Usually, that's an old 5W iPhone cube or a standard laptop USB port (which outputs 2.5W - 4.5W). Wireless charging is inefficient; it loses ~30% of energy to heat. To output 15W to the phone, the charger needs at least 20W of input.
If the input is only 5W, the charger cannot negotiate a "Fast Charge" handshake. It defaults to the lowest safety standard: 5W output (or less). The user sees a "Charging" icon, but the battery percentage barely moves.
In practice, this is often where Tech Gifting Experience decisions start to be misjudged. You bought a Ferrari engine (the charger) but fueled it with lawnmower gas (the adapter).
The Fix: Either 1) Bundle a QC3.0 or PD 20W Adapter in the box (adds ~$3-4 cost), or 2) Clearly label the packaging: "Requires 20W Adapter for Fast Charging." Managing user expectations is just as important as the hardware specs.
