Glaais YJ-781B 20,000mAh Heated Vest Battery Pack

Vest: Glaais YJ-781B is a rechargeable battery pack for compatible heated apparel, with a stated 20,000mAh capacity, DC and USB outputs, and a digital display. The listing gives different runtime figures across sections, so treat them as estimates tied to clothing power draw and heat setting.

At a glance

Listing describes DC 7.4V and USB 5V outputs for heated apparel, and excludes 12V heated devices.
Battery runtime is claimed as 5–7 hours on high, 7–11 hours on medium, and 11–16 hours on low in one section. Another gives 7–10 hours on medium.
A digital display is described as showing remaining power from 1% to 100%.
The claimed package includes two DC adapters for several plug sizes, plus a USB-A to USB-C charging cable.

Price

$28.99Save 12%

Reference price: ~~$32.99~~

Price checked: Nov 13, 2026

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Pros and cons

Pros

The stated capacity and multiple output types make the pack applicable to supported 7.4V and 5V heated clothing.
A digital battery-level display gives a visible charge estimate.
The listing describes adapters for 3.5mm and 3.8mm plugs, alongside a 4.0mm DC port.

Cons

Compatibility is voltage- and connector-dependent, so this is not a universal replacement for heated-apparel batteries.

Technical specifications

14 specifications

Identity
Brand	Glaais
Model	YJ-781B
Color	Black

Power and battery
Capacity	20000 milliamp_hours
Power configuration	DC
Battery cell type	Lithium Polymer
Rechargeability	Rechargeable
Ports listed	3
Output current	3 A
Connector type	USB Type C

Dimensions and installation
Dimensions listed	0.1 x 0.1 x 0.1 inches
Weight listed	280 g

Features and use
Display	Digital Display
Compatible device listed	Smartphone

What to know before buying

Listing details to confirm

Listing details are inconsistent or unconfirmed: it gives 7.4V and 5V in the title and apparel description, while the capacity is also described at 3.85V and the technical voltage field is malformed. Runtime claims vary between 7–11 and 7–10 hours on medium, and listed port-count details do not clearly reconcile with the described output connections. Confirm your garment's voltage and connector size, runtime expectations, and the selected package contents before buying. The maker also says runtime varies with garment wattage and temperature setting and excludes 12V heated devices.

Who is it for?

A good fit for

Owners of compatible 7.4V or 5V heated vests, jackets, or pants who want a replacement or spare battery.
Buyers whose heated apparel uses a listed 3.5mm, 3.8mm, or 4.0mm DC connection, after confirming the required plug.

Less suited to

Owners of 12V heated apparel or garments with an incompatible connector.
Buyers who need a verified runtime guarantee or precise dimensions, since the listing's runtime and dimension information is inconsistent or implausible.

Glaais YJ-781B 20,000mAh Heated Vest Battery Pack · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.4 / 5 · 175 ratings

5 stars76%76%
4 stars11%11%
3 stars2%2%
2 stars2%2%
1 star9%9%

Customer feedback highlights perceived battery life, charging speed, quality, and value. One customer report cited about 12 hours on medium, which is within the listing's stated range, but the product page itself gives two different medium-runtime ranges. These reports may help set expectations, but they do not establish performance for a particular garment or confirm compatibility.

Positive themes

Customers are reported to appreciate battery life and charging speed.
The feedback summary describes customers as finding the pack good value and longer-lasting than an OEM unit.

Frequently asked questions

Which heated clothing can this battery power?

The listing claims compatibility with many 7.4V and 5V heated garments, including certain ORORO models, and says it does not work with 12V heated devices. Confirm your garment's voltage and connector before purchase.

How long is the claimed runtime?

The listing states 5–7 hours on high and 11–16 hours on low. Medium is listed as both 7–11 hours and 7–10 hours in different sections. Actual use is said to vary with garment wattage and temperature setting.

What connectors and adapters are described?

The pack is described with a 4.0mm DC port and two adapters for 3.5mm and 3.8mm plugs. The listing also names USB Type C. Check the selected listing and your garment's connector.

Does it include a charging cable?

The claimed package list names a USB-A to USB-C charging cable, an instruction manual, and two DC adapters. Verify contents in the selected listing.