ASUNT Makita 18V USB-C Battery Adapter, PD 100W Max

ASUNT Makita 18V USB-C Battery Adapter is a battery-mounted charger and device power source with USB-C input/output and USB-A output. Its dual role may suit users who want to recharge a compatible battery or power small devices, but it cannot do both at once.

At a glance

USB-C is described as both an input for recharging a compatible battery and an output for charging devices.
The listing specifies a separate USB-A QC3.0 output rated at 24W.
An LED display is claimed to show battery level and charging status. The listing says discharging the battery is needed to calibrate its displayed level.

Price

$33.99Save 15%

Reference price: ~~$39.99~~

Price checked: 13 Nov 2026

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Pros and cons

Pros

Two-way USB-C use offers a way to recharge a compatible battery or use it as a power source for devices.
USB-A and USB-C outputs give options for charging different devices.
The LED display is intended to show battery and charging status.

Cons

It cannot accept input and provide output at the same time.
The listing says it only charges 18V batteries and warns against charging a battery below 18V.

Technical specifications

11 specifications

Identity
Brand	ASUNT

Dimensions and installation
Dimensions listed	6D x 5W x 4H centimetres
Compatible battery family	Makita 18V batteries BL1850B, BL1860B, BL1840B, BL1830B, BL1820B, BL1815 and more

Charging and ports
USB-C input	PD protocol, 100W, 5-20V/3-5A
USB-C output	PD3.0 100W(MAX)
USB-A output	24W QC3.0
Input voltage	20 Volts
Connector type	Type-C

Compatibility and use
Compatible devices	Makita 18V batteries, mobile phones, tablets, laptops, cameras, Bluetooth headphones
Battery charging claim	20V/5A, 18V/5A battery can be fully charged in about 40 minutes

Other listed details
Display	LED display

What to know before buying

The listing says the adapter fits specified Makita 18V batteries and other compatible models, but cannot fit batteries from other brands. It also says not to charge a battery below 18V, and that input and output cannot operate at the same time. The approximately 40-minute full-charge claim is stated for 20V/5A and 18V/5A batteries. The LED level may be inaccurate until the battery is discharged to calibrate it. The claimed 100W USB-C rating is a maximum, not a stated guarantee for every device or charging condition.

Who is it for?

A good fit for

Makita 18V battery owners seeking USB-C device charging or a way to recharge a compatible battery through USB-C.
People carrying phones, tablets, cameras or other listed devices who can accept the adapter's battery and simultaneous-use limits.

Less suited to

Owners of battery brands other than Makita.
Anyone needing the battery to charge while the adapter powers another device.
Users who need to charge a battery below 18V.

ASUNT Makita 18V USB-C Battery Adapter, PD 100W Max · photo 2 — Additional product photo 2

Customer reviews on Amazon

5 / 5 · 1 ratings

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Only an aggregate rating is supplied, based on a single rating, so it offers very little evidence about real-world experience and cannot establish how well the adapter performs. Consider the listed battery compatibility, simultaneous-use restriction and display calibration caveat when deciding whether its features suit your needs.

Frequently asked questions

Can this adapter charge a Makita battery and a device at the same time?

No. The listing says it cannot take input and provide output at the same time.

Which batteries does it fit?

The listing names Makita 18V batteries including BL1850B, BL1860B, BL1840B, BL1830B, BL1820B and BL1815, and says it cannot fit other brands.

Can it charge a battery below 18V?

The listing says it can only charge an 18V battery and warns against charging a battery below 18V.

What does the LED display show?

It is claimed to show battery level and charging status. The listing cautions that the level may not be accurate until the battery has been discharged to calibrate the display.