Low-quality unprotected hair dryer — this is what happens with cheap components
Don't Get Burned: The 18650 Battery Problem
If your product uses 18650 lithium cells, you have a problem: up to 60% of cells on the market have inflated capacity claims. We have seen cells labeled 3000mAh that tested at barely 1400mAh.
Red Flags to Watch For
- Impossible capacity claims: No 18650 cell exceeds 3600mAh. If they claim 5000mAh+, it is fake.
- No brand name: Legit cells come from Samsung, LG, Panasonic, Sony/Murata, or reputable Chinese brands (EVE, BAK, Lishen)
- Suspiciously low pricing: A genuine Samsung 35E costs $3.50-4.50 in volume. If you are paying $1.50, it is fake.
How We Verify Batteries
- Weight check: Genuine cells have consistent weight. Fakes are often lighter.
- Capacity test: Discharge at 0.2C and measure actual mAh output
- Internal resistance: Above 50mohm for a new cell is a warning sign
- Visual inspection: Check wrapper quality, QR codes, terminal flatness
Compliance Notes
For US/EU markets: UL 2054 and UN 38.3 testing is mandatory. Factor $3,000-5,000 for certification into your launch budget.