LUCKYDUO MagSafe Power Bank (KL-YD45) Review: Very Slim, Slow Wireless Charging

This is the English edition of a review from my Japanese YouTube channel, iestaLife. I review gadgets from my home studio in Japan, so product links go to Amazon Japan.

Quick take

The LUCKYDUO KL-YD45 is a thin 5,000 mAh MagSafe power bank that sits on the back of an iPhone without feeling bulky. Wireless charging is slow and it gets warm, so I treat it as a top-up battery for when I’m out, not something to rescue a nearly dead phone.

LUCKYDUO KL-YD45 on the back of an iPhone 15 Pro Max — On an iPhone 15 Pro Max, with an iPhone 13 mini on the right

What I tested

LUCKYDUO KL-YD45 (grey; it comes in five colours)
iPhone 15 Pro Max and iPhone 13 mini
A timed wireless charge from a low battery, with and without a case
A MagSafe ring plate stuck to the back of the power bank

What I found

Slim and easy to live with. It is about as thick as an iPhone 15 without a case, fits the hand well, and holds on firmly enough to lift the phone by it. On the 13 mini it sticks out only slightly; without a case it can shift a little, though charging continues.
Slow wireless charging. From 9% it reached 31% after about 30 minutes in a case, then 49% after roughly another 30 minutes with the case removed. Removing the case made little difference.
It gets warm. Both the power bank and the iPhone heated up noticeably — not too hot to hold, but I wouldn’t leave it charging in hot weather outdoors.
USB-C in and out. You can charge non-MagSafe devices with the included cable, four LEDs show the charge level, and with the bank plugged in it can charge itself and the iPhone at the same time.
Capacity: the iPhone 15 Pro Max battery is around 4,500 mAh, so think of it as roughly one top-up in theory.
A MagSafe ring plate on the back turns it into a grip and stand, so you don’t need a power bank with a built-in stand.

Charging the LUCKYDUO KL-YD45 over USB-C

Who it’s for

People who want a slim battery that can stay on the iPhone
Topping up during a commute or day out
Not for fast wireless charging, or for running a near-empty phone at full tilt

Watch the review

【めちゃ薄の衝撃】Mag Safe充電対応モバイルバッテリーならいつでもiPhoneが２倍長持ち？

The video is in Japanese. The charging-speed test starts at about 8:30.

Limitations

One charging run on one iPhone, timed by me, not a lab test. Wireless output is listed as up to 15 W, but I did not measure it. Availability outside Japan may vary.

Products

LUCKYDUO MagSafe power bank, 5,000 mAh: on Amazon Japan

The Amazon Japan links above are affiliate links. As an Amazon Associate, I earn from qualifying purchases. Check the listing for the exact model, current price and shipping availability in your region.

More reviews in English