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3 x AA Battery Holder (4.5V)

Power

Battery holder that puts three AA batteries in series for 4.5V, with a red (+) and a black (−) wire. For powering loads that draw current, such as a mini pump or a small DC motor, apart from the Arduino: run from the Arduino's 5V pin, they can reset the board as they start. Put the batteries in following the holder's + / − marks. Some models have an on/off switch and a cover.

Specifications

Output voltage

4.5V (3 × 1.5V alkaline)

Batteries

3 × AA

Connection

Red (+) and black (−) wire

Capacity

~2000 mAh with alkaline AA

Options

Models with a switch and a cover

Shop prices

• HobiDevreIn stock14.40 ₺
• Robo90In stock15.87 ₺
• KomponentciIn stock16.13 ₺
• Direnc.netIn stock16.74 ₺
• RobocomboIn stock17.00 ₺
• Robolink MarketIn stock18.00 ₺
• RobotistanIn stock19.65 ₺
• RobotzadeIn stock24.00 ₺
• Entegre DünyasıIn stock59.61 ₺

Prices read from the shops' pages on 22 October 2026. Prices and stock may have changed since; check at the shop before you buy.

Projects with this part

• Automatic Plant WateringIntermediate50 minA system that waters a potted plant by itself once the soil dries out: the soil moisture sensor measures moisture as a percentage, and when it drops below 30% the Arduino runs the mini submersible pump for 3 seconds through a relay, waits for the water to soak in, measures again and repeats until moisture passes 50%. The pump runs on three AA batteries of its own; the relay keeps that circuit fully apart from the Arduino. If 5 waterings in a row leave the soil dry, the tank counts as empty and the pump is stopped so it never runs dry. It teaches calibrating a sensor into a percentage, switching a separately powered load with a relay, powering a sensor only while it reads to slow its corrosion, and guarding a system against faults. No extra library needed.Open project
• Joystick Pan-Tilt Camera HeadBeginner40 minA camera head built from two servos: the bottom servo turns the camera left and right, the top one up and down, and you steer it with a joystick. The further you push the stick the faster the head turns, and it stays where it is when you let go; pressing the joystick sends both servos slowly back to the middle. The servos run from a separate 3 x AA battery holder, with the grounds joined. It teaches turning an analog stick into a speed with a dead zone, moving servos smoothly and within limits with millis(), and powering more than one servo from a supply of their own. The Servo library comes with the Arduino IDE; there is nothing to install.Open project