Power & Batteries

SKU: AF-4191 | Brand: Adafruit

A slim 2×AAA battery holder with a built-in on/off switch and genuine JST PH connector. Two AAA batteries in series provide approximately 3V — ideal for powering low-voltage electronics projects, microcontrollers, and...

SKU: FT-LEVEL | Brand: Freetronics

Many of the most interesting sensors and devices are only available in 3.3V or even lower voltage versions, which can be a problem if you want to connect them to a 5V microcontroller such as an Arduino. This module...

SKU: AF-3951 | Brand: Adafruit

A 2×AA battery holder with a built-in knife switch for controlling power. Unlike typical slide switches, the knife switch provides a clear visual indicator of open and closed circuit states — making it an excellent to...

SKU: MB-99830 | Brand: Makeblock

Description:Powers the other blocks. Connect and press to power on. Press and hold for 3 seconds to power off. Description Figure: Features:The magnetic design at the back of Neuron blocks makes you can simp...

SKU: AF-501 | Brand: Adafruit

This 5V 1A USB power supply provides clean, regulated power for microcontrollers, development boards, and USB-charged devices. It accepts 110–240V AC input and outputs via a USB Type-A port, so you simply plug in what...

SKU: TB-SZ2043 | Brand: Little Bird

An inline mini blade fuse holder with an integrated failure indicator lamp that lights up when the fuse blows. This makes it easy to identify a blown fuse, especially in crowded or hard-to-reach wiring locations. The ...

SKU: AF-988 | Brand: Adafruit

This little dongle will let you connect one of our 5V 2Amp or 5V 10Amp adapters to something that expects to connect to USB. The premise is simple - one end has a USB A female jack and the other has a 'standard' 5....

SKU: PI-COM1303 | Brand: Pimoroni

DC power jack/connector. This is a common barrel-type power jack for DC wall supplies. These have a 5.5mm jack, with a 2.1mm center pole diameter. Datasheets: Datasheet

SKU: AF-1328 | Brand: Adafruit

Turn any 2.1 mm barrel-jack wall adapter into a handy bench power supply with this adapter cable. The moulded DC barrel jack connects to your power supply, while colour-coded alligator clips (red for centre-positive, ...

SKU: LB-BK-00081 | Brand: Little Bird

Running a Paper Circuits Class or need lots of batteries for E-Textiles and Wearables?  This is our best-priced Coin Cell Battery.CR2032 Button Cell Battery - Great for use with the Lilypad Switch Battery Holder....

SKU: AF-2849 | Brand: Adafruit

This is a handy little non-rechargeable CR2016 Lithium Coin Cell Battery!Sitting at 20mm diameter and is 1.6mm thick it's small but packs a punch with a nominal voltage output of 3V and a capacity of 90mAh. For other ...

SKU: AF-2850 | Brand: Adafruit

The CR2450 is a high-capacity 3V lithium coin cell battery, ideal for powering microcontroller projects, sensors, key fobs, and other small electronics that need reliable, long-lasting power. With a generous 610mAh c...

SKU: SF-TOL-08734 | Brand: SparkFun

Two pin JST connector to a 2.1x 5.5mm barrel jack, 6.25 inch long jumper cable. We use this cable to adapt from a wall power supply to a relatively small, SMD JST connector. We found that many of the SMD connectors...

SKU: SF-PRT-07948 | Brand: SparkFun

A through-hole 12mm coin cell battery holder for PCB mounting. Uses friction to hold the battery securely in place — the metal housing is positive (+) and the PCB pad underneath is negative (−). Commonly used for RTC ...

SKU: SF-PRT-00783 | Brand: SparkFun

Basic 20mm coin cell holder. Posts can be inserted into 0.1" perf board! Holds the common CR2032 type batteries.

SKU: SF-PRT-13855 | Brand: SparkFun

A slim, lightweight 3.7V 2000 mAh lithium-ion battery terminated with a standard 2-pin JST-PH connector (2 mm pin spacing). Built-in protection circuitry guards against overvoltage, overcurrent, and undervoltage condi...

SKU: SF-TOL-13831 | Brand: SparkFun

This is a high-quality switching ‘wall wart’ AC to DC 5.1V 2,500mA USB Micro-B wall power supply manufactured specifically for projects that require a higher level of power. This compact USB AC charger is UL and CS...

SKU: PL-2173 | Brand: Pololu

A male Tamiya-style high-current connector with two pre-crimped 10cm 14-AWG silicone-insulated leads. This keyed connector is commonly used with 7.2V RC battery packs and features a latch to prevent accidental disconn...

SKU: PL-2119 | Brand: Pololu

The Pololu S7V7F5 is a compact buck-boost switching voltage regulator that accepts a wide input range of 2.7 V to 11.8 V and produces a fixed 5 V output with typical efficiency over 90%. It automatically steps up or s...

SKU: SF-PRT-13189 | Brand: SparkFun

A standard 18650 lithium-ion rechargeable cell with pre-attached solder tabs for easy integration into custom battery packs and projects. With 2,600mAh capacity at 3.7V, it provides reliable power for a wide range of ...