Update: This popular Frontpage deal is available again with a new promo code.
B King via Amazon has
LISEN 5000mAh Qi2 Wireless 15W Ultra Slim MagSafe Power Bank w/ 22.5W USB-C & 1.6' USB-C to USB-C Cable (Ice Gray) on sale for $24.98 -
$7.99 off when you apply promo code
TCS6NMYT at checkout =
$16.99.
Shipping is free with Prime or on $35+ orders.
Thanks to Deal Hunter
Navy-Wife for posting this deal.
- Note: You must be logged in to apply promo codes; promo codes are typically for one-time use and don't always apply seamlessly. If you run into this issue, refresh the page, re-enter the code, or revisit the cart page.
Details:
- Ultra-slim Qi2 magnetic power bank: 0.3 inches thick, 5,000mAh capacity; Qi2-certified for efficient 15W wireless charging
- Fast charging: 15W wireless (up to 50% in 1 hour for iPhone 17); 22.5W wired; speed reduces after 75% charge
- Portable & lightweight: Thinner than iPhone 15; 12N strong magnets for secure snap-on fit; ideal for commuting, travel, classes, parties, concerts
- High safety & certifications: Lithium-polymer battery with NTC temperature control and overcharge protection; FCC, CE, RoHS, UL, PSE, Qi2 certified; no recalls or safety issues
- Compatibility note: Optimized for MagSafe iPhones (12–17 series); non-MagSafe cases may cause heating; avoid gaming while charging
- Package contents: 1× LISEN ultra-slim MagSafe power bank, 1× 1.6ft USB-C to USB-C cable
Top Comments
tl;dr: The Wh rating provided on power banks is agnostic of the voltage and would be a better "apples to apple" comparison of power bank capacity than mAh ratings. Wireless charging is inefficient and compared to wired loses 25-50% capacity due to losses.
The details:
Specified mAh capacity refers how much power can be delivered at a certain current over the time that the battery has power. If this is not specified with a particular voltage is, it's referring to the voltage of the battery cells inside the power bank, which is why they specify at 3.6 V.
The voltage can be upconverted to a "standard" USB 5V but that reduces the mAh rating proportionally . I've looked at my Anker/Ravpower/Belkin/Inui/Baseus banks and they all specify at 3.6 V. Sometimes the conversion to 5V is also given but not usually.
Wh capacity of a battery pack takes the voltage into account, and is a "clearer" representation of power capacity.
As a second issue - wireless charging is intrinsically much less efficient than wired charging (even when wired, a "3000 mAh battery pack" may need 4000 mAh to charge it), and at best case scenario wireless charging only delivers 3/4 (compared to wired charging) of the power capacity to the charged unit, with the remain lost to heat and other conversion inefficiencies. Realistically with wireless charging even in best case scenarios a 3000 mAh phone battery may only be half charged by a 3000mAh power bank.
At worse (poor alignment, greater separation) it could be less than half of this.
Community Reviews
This ultra slim Qi2 MagSafe power bank stands out for pocketable, cable free top ups on the go, especially with Samsung Galaxy and Pixel phones in MagSafe cases or an iPhone snapped on for travel. The slim shape and light feel make it easy to carry in a purse, backpack, or pocket, and the build quality and price are described as solid. The main caveat is capacity and consistency, since the pack is effectively around 3000mAh after conversion losses and wireless charging, so it may only add a partial charge. Fit and charging behavior also vary by phone and case, with some setups disconnecting or failing to align well.
people who want a cable-free emergency top-up because they're "on the run and can't deal with cables, but want a little boost," and the slim size makes it easy to carry in a purse or backpack for low-battery situations
Samsung Galaxy S23/S24 Ultra owners using a MagSafe case because commenters said it snaps on and charges on the go without cables (and worked on their S23/S24 Ultra + Mag case)
buyers who are okay with retrying promo code entry because multiple commenters said the deal price/code eventually worked after refreshing, switching browser modes, or re-adding the item to the cart
Pixel 10 Pro XL owners who want a slim wireless option for travel because at least one commenter said it works fine on their Pixel 10 Pro XL
travelers who only need a short-term "top-up" rather than a full recharge because commenters framed these as useful for when you're out late and running low on juice to last until you can get home or a ride
buyers who need reliable wireless charging every time because multiple commenters reported it disconnecting/reconnecting frequently or failing to charge properly (including "won't charge for more than ~10 seconds" or losing power and heating the phone)
iPhone users who rely on consistent MagSafe alignment with an OEM/third-party case because commenters reported frequent disconnects or poor charging with certain cases (including an OEM Apple case and a Casify case)
people traveling to China who need CCC certification because commenters warned it is not CCC certified and could be confiscated
Samsung Galaxy S26U owners because one commenter said wireless charging "will not work well" due to Qi2 coil placement
iPhone 13 owners who expect a full recharge from the rated capacity because a commenter said it "can't even do 1 full recharge" on an iPhone 13 and that the listing should be clearer
Common Questions (5)
AI-generated summary based on comments from the community. Updated ago
Join The Conversation
Share your experience with the Slickdeals community
Share information with the community. Please follow our Community Guidelines and be kind!
82 Comments
Sign up for a Slickdeals account to remove this ad.
It's back again. New code is TCS6NMYT
Sign up for a Slickdeals account to remove this ad.
https://www.amazon.com/dp/B0CB1FW5FC
Note: Amazon promo codes don't always apply seamlessly. If you run into this issue, refresh the page, re-enter the code, or revisit the cart page.
Expired promo code:
https://www.amazon.com/dp/B0CB1FW5FC
It depends on your use case. I don't rely on the Lisen to fully charge my phone from 0% (because it doesn't) but it will help me get through a long day on heavy usage.
Sign up for a Slickdeals account to remove this ad.
Join The Conversation
Share your experience with the Slickdeals community
Share information with the community. Please follow our Community Guidelines and be kind!