Is there overvoltage control for 12 volts input instead (to the dummy battery)? Will this break the device over time?

The product information says the dummy battery has over voltage protection, but is not clear whether this is only in reference to a transient spike over 9 volts. I would guess that it would eventually fail if continuously run off 12 volts, rather than the 9 volt adapter it is shipped with, but this is only speculation.

Would this work with the Nikon Z50?

The Nikon website shows that the Z 50 takes a different battery.

is this compatible with the D90?

A quick google search shows that the D90 takes the EN-EL3 battery. So you're looking at a completely wrong battery system here.

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Dummy Battery with AC/DC Coupler Power Adapter for EP-5B/EN-EL15

Product ID: 476925719

Details

Amperage
0.23 A
Brand
NEEWER
Color
Black
Connector Type
Barrel
Included Components
1 x DC Coupler
Input Voltage
240 volts

⚡3A stable current delivery

🔋27W continuous power output

🔌Compatible with 240V AC input

NZ$114

Duties & taxes included

In stock

Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔋 Power your passion nonstop with NEEWER’s dummy battery adapter!

SAFETY FIRST - Built-in short circuit protection keeps your gear safe during intense sessions.
EFFORTLESS SETUP - Plug-and-play design lets you power up in seconds—no tech headaches, just pure creativity.
LIGHTWEIGHT DURABLE - Crafted with nylon and polyurethane for a sleek, travel-ready power solution.
ENDLESS SHOOTING POWER - Say goodbye to battery swaps with continuous AC power for marathon shoots.
SEAMLESS COMPATIBILITY - Perfectly engineered for Nikon’s EN-EL15 battery slot across top-tier Z and D series models.

The NEEWER Dummy Battery with AC/DC Coupler is a reliable replacement power supply designed for Nikon cameras using the EN-EL15 battery. Delivering 27 watts at 9 volts and 3 amps, it enables unlimited shooting time by connecting your camera directly to AC power. Compatible with a wide range of Nikon Z and D series models, it features easy installation, built-in short circuit protection, and a lightweight, durable design—ideal for professional photographers and videographers who demand uninterrupted performance.

Specifications

ASIN	B0B5WY8T96
Amperage	0.23 A
Best Sellers Rank	#11 in Camera Power Adapters
Brand	NEEWER
Built-In Media	1 x DC Coupler Dummy Battery (Replacement for EP-5B), AC Power Cord, Adapter Charger
Color	Black
Compatible Devices	Nikon Z5, Z6, Z7, Z6 II, Z7 D500, D600, D610, D750, D7000, D7100, D7200, D7500, D800, D800E, D810, D850, D800A
Compatible Phone Models	Nikon Z5, Z6, Z7, Z6 II, Z7 II, D500, D600, D610, D750, D7000, D7100, D7200, D7500, D800, D800E, D810, D850, D800A
Connectivity Technology	AC Power Corded
Connector Type	Barrel Connector
Current	DC
Current Rating	3 A
Customer Package Type	FFP
Customer Reviews	4.4 4.4 out of 5 stars (136)
Enclosure Material	Nylon, Polyurethane
Frequency Range	50-60 Hz
Input Voltage	240 volts
Item Weight	10.23 ounces
Main Power Connector Type	2 Pin
Manufacturer	NEEWER
Mfr Part Number	10101136
Model Number	NT-EL15
Mounting Type	Wall Mount
Number of Items	3
Number of Power Levels	1
Output Current	3 A
Output Voltage	9 volts
Power Plug	CEE 7/16 Europlug
Power Source	Corded Electric
Special Features	Short Circuit Protection, Lightweight Design
Specification Met	CE, FCC, RoHS
Unit Count	1 Count
Warranty Description	1 Year Manufacturer
Wattage	27 watts

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