Zishine Energy (Shenzhen) Co., Ltd. has published a detailed internal test report on the MagSafe compatibility of its magnetic wireless power bank series, an unusual move for an OEM manufacturer that the company says reflects its commitment to transparent product claims. The report documents how Zishine's magnetic power banks align, attach and charge with a range of iPhone generations, and it quantifies the way common variables - case thickness, magnet strength and charging coil offset - affect real-world performance. Brand buyers and distributors can request the full document through Zishine's sales channel, and a shorter consumer-facing version is available for brands to adapt into their own packaging and product pages.
The testing program was prompted by a recurring question from OEM clients: how reliably do third-party magnetic power banks actually stay attached and charge efficiently on various iPhones, especially when a protective case is involved? Rather than relying on marketing claims, Zishine's engineering team built a controlled test rig at the Shenzhen R&D center and measured attachment force, coil alignment offset, wireless charging efficiency and thermal behavior across a representative sample of iPhone models spanning several generations. Each test was repeated multiple times to average out small variations in hand pressure and placement, and the raw measurements were logged so buyers can see not just the average but the spread of results.
The first test series measured magnetic attachment force on bare phones. Zishine tested each power bank against iPhone models known to contain the MagSafe magnet array, recording the pull-off force required to separate the power bank from the back of the phone. The results showed that Zishine's magnet array, which was tuned through repeated iterations, delivered consistent attachment across the tested models without the weak spots some buyers report with generic magnetic accessories. The report notes that attachment force is not the only metric - it must be balanced against the ability to slide and reposition the unit comfortably, and against the risk that too strong a magnet could interfere with card wallets or nearby metal objects.
The second series addressed the effect of protective cases. This is where many magnetic power banks disappoint users, because even a thin case can shift the charging coil off-center and reduce efficiency. Zishine tested its power banks with cases of varying thickness, from thin silicone shells to thicker rugged cases, recording both whether the magnets still engaged and whether the phone entered 15-watt wireless fast charging or fell back to a slower charging rate. The report provides a clear threshold: below a certain case thickness, fast charging is reliably maintained; above it, users should expect slower charging or occasional alignment drop-offs. This lets brands set realistic expectations in their own product descriptions rather than promising universal fast charging.
A third series looked at charging efficiency and heat. Using a power analyzer and thermal camera, engineers measured how much of the power bank's output reached the battery versus being lost as heat under different alignment conditions. The data confirmed that when coil alignment is off by even a few millimeters, efficiency drops and surface temperature rises. This is why Zishine tunes its magnet array to pull the phone into the optimal coil position rather than simply holding it anywhere on the back. The report includes efficiency curves and temperature readings that buyers can use in their own product documentation, and it correlates those readings with the alignment offset numbers from the earlier series.
The report also covers edge cases that often generate complaints. It documents behavior with wallets or card pockets attached to the back of the phone, with metal plates used for car mounts, and with phones older than the MagSafe ecosystem that rely on external magnetic rings. For each scenario, the report states clearly whether the power bank charges, whether attachment is secure, and what accessories should be removed for best performance. This level of granularity is designed to reduce after-sales returns by setting realistic user expectations before purchase. Zishine's support team often references these edge cases when answering distributor questions, because many compatibility complaints trace back to users combining accessories in ways the manufacturer never tested.
Zishine says publishing this report is a way to differentiate from competitors who overstate compatibility. Many magnetic power banks on the market are advertised as universally compatible when in practice they work reliably only on a narrow set of phones and cases. By sharing its own test data, Zishine lets brand buyers make informed decisions about which models to stock and what user guidance to include in packaging. The company also hopes the report will help end users understand that magnetic wireless charging is a precision system, not simply a magnet stuck to a phone, and that small changes in setup can meaningfully affect charging speed and safety.
For OEM/ODM partners, the report doubles as a starting point for customization. Brands that sell primarily to users of a specific iPhone generation or case style can work with Zishine to tune magnet strength, coil position or even add NFC alignment markers. Zishine's engineering team uses the same test rig to validate any hardware changes before mass production, ensuring that a custom magnet array behaves as well as the reference design. This closed-loop testing is part of the company's broader quality system certified to ISO9001, and it means that a private-label power bank with a modified magnet layout still passes the same compatibility checks as Zishine's standard product.
The report is already being used by several Zishine clients in their own marketing materials. One European partner adapted the case-threshold data into a simple infographic explaining which cases support 15-watt charging, and reported a noticeable drop in compatibility-related returns after the graphic was added to its product page. A North American e-commerce seller used the attachment-force measurements in its listing comparison against competing magnetic power banks, highlighting the difference between a tuned magnet array and generic magnets. Zishine encourages clients to reuse the data under agreed branding terms, because accurate user expectations ultimately benefit the whole category.
The full MagSafe compatibility test report is available on request to qualified buyers. Zishine also provides a shorter consumer-facing version that brands can adapt for their own product pages and packaging inserts. If your company sells magnetic power banks or is evaluating a private-label program, contact the Zishine team at hushijun@sunhetech.com or +86 138-2522-1556 to receive the report, request sample units for your own testing, or discuss a customized magnet and coil configuration for your target market.
