AJ16 Metal Glass Magnetic Power Bank | Premium 15W Qi OEM

Frequently Asked Questions: AJ16 Metal Glass Magnetic Power Bank

1. Is the tempered glass back on the AJ16 durable enough for daily use or will it shatter?

The AJ16 uses chemically tempered aluminosilicate glass — the same class of material used in premium smartphone backs — with a Vickers hardness rating of approximately 650HV and a compressive stress layer exceeding 400MPa. In plain terms, it is highly resistant to scratches from keys, coins, and everyday pocket debris, and it withstands drops from waist height onto hard surfaces in YULIDA’s internal testing. The glass is bonded to an aluminum alloy frame with a shock-absorbing adhesive layer that distributes impact force. While no glass is unbreakable, the AJ16’s glass back is engineered for real-world durability, not just aesthetics. For B2B buyers concerned about returns, we provide drop-test certification data upon request.

2. How does the AJ16 achieve a 7.5mm thickness — thinner than most smartphones — with wireless charging inside?

The 7.5mm body is achieved through three engineering decisions. First, the wireless charging coil is an ultra-thin 0.3mm planar coil etched onto a flexible PCB rather than the traditional wound copper wire coil (typically 0.8-1.2mm). Second, the 5,000mAh battery uses a custom 4mm-thick polymer cell — thinner than any standard catalog cell — developed specifically for the AJ16. Third, the metal frame serves double duty as both the structural chassis and the heat spreader, eliminating the need for a separate internal mid-frame. These three savings compound to bring the total thickness under 8mm while maintaining full 15W wireless and 20W wired output. This is YULIDA’s thinnest wireless power bank by a significant margin.

3. Does the metal body interfere with the magnetic wireless charging or cause overheating?

The AJ16’s aluminum alloy frame is designed with a non-conductive break that electrically isolates the wireless charging area from the rest of the metal body. This prevents eddy currents — the circulating electrical currents that would otherwise be induced in a solid metal loop by the wireless charging field, causing energy loss and heat. The metal frame actually improves thermal performance by acting as a large passive heatsink, drawing heat away from the wireless coil and battery and radiating it across the entire body surface. In YULIDA’s thermal imaging tests, the AJ16 runs 3-5°C cooler at the wireless charging surface than plastic-bodied equivalents, because metal conducts and dissipates heat more efficiently than polymer.

4. Why only 5,000mAh — is the AJ16 meant to be a primary power bank or a fashion accessory?

The 5,000mAh capacity is a deliberate design choice, not a limitation. The AJ16 is positioned as a premium fashion-tech hybrid: it provides one full smartphone charge (approximately 0.9-1.1 charges for iPhone 15, 0.8 charges for Galaxy S24) in a form factor that is 7.5mm thin and wrapped in materials you would expect on a luxury watch, not a power bank. For B2B buyers, the AJ16 targets a different customer than high-capacity power banks — it competes in the premium accessories market alongside leather phone cases, designer AirPods cases, and luxury cardholders. The customer who buys an AJ16 already has a 20,000mAh power bank for travel; the AJ16 is what they carry daily because it looks and feels like a considered accessory rather than a utilitarian tool.

5. What color and finish options are available for the metal and glass surfaces?

The AJ16 is available in three standard finishes: Silver (brushed aluminum with clear glass), Black (anodized matte black aluminum with dark tinted glass), and Brown (anodized bronze-tone aluminum with clear glass). The glass back on all colors features an oleophobic coating that resists fingerprints — the same coating technology used on smartphone screens. For OEM orders at 1,000+ units, custom anodization colors are available, including rose gold, navy blue, forest green, and champagne. The glass can be customized with a subtle etched pattern (dots, lines, or a brand monogram) that is visible at certain angles but does not interfere with wireless charging. This material palette positions the AJ16 in the same visual category as premium consumer electronics rather than commodity power banks.

6. How does the AJ16’s 20W Type-C output perform given the smaller 5,000mAh battery?

The 20W PD output is fully available from the Type-C port regardless of the 5,000mAh capacity. The AJ16 can deliver a sustained 20W (9V/2.22A) until the battery is depleted — approximately 25-30 minutes of full-speed output before the battery reaches empty. In practice, this is enough to fast-charge most phones from 0% to about 60% via cable, which is exactly the use case the AJ16 is designed for: a quick, powerful top-up when you need it most. The 20W capability also means the AJ16 itself recharges quickly — from 0% to 100% in approximately 1.5 hours with an 18W PD charger. The small battery capacity combined with fast input and output makes the AJ16 one of the most time-efficient power banks for urban professionals who need speed, not endurance.

7. What OEM customization options position the AJ16 for the luxury and corporate gifting markets?

At MOQ 500, the AJ16 is YULIDA’s premier platform for high-end customization. The tempered glass back can be laser-etched with intricate brand artwork at sub-millimeter precision — techniques like light-catching micro-engraving that creates a subtle holographic effect visible only when the device is tilted. The metal frame can be engraved with serial numbers, limited edition numbering, or a brand motto. Premium packaging options include a rigid two-piece magnetic box with a suede-lined interior, a clear acrylic display case for retail, or a slim leather-look sleeve. For luxury brand collaborations, the AJ16 can be positioned as a “tech accessory” rather than a “power bank” — a distinction that commands significantly higher retail pricing. Custom gift sets pairing the AJ16 with a matching-branded USB-C cable and cleaning cloth create a complete premium unboxing experience that reflects well on the gifting brand.