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Power / Batteries

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Pololu 9V, 15A Step-Down Voltage Regulator D24V150F9
$85.95  
3 pc(s)
This synchronous switching step-down (or buck) regulator takes an input voltage of up to 40 V and efficiently reduces it to 9V with an available output current of around 15 A. Typical efficiencies of 80% to 95% along with its high current capabilities make this regulator well suited for...
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9V Battery Holder with On/Off Switch, 3-Pin JST
$2.50  
5 pc(s)
Enclosed battery holder for 9V battery. This holder features a lid that slides over the batteries and snaps into place to fully enclose the battery. It also features a switch that lets you open and close the electrical connection between the batteries and the holder's leads. The leads are...
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4 x AA Battery Holder with On/Off Switch, 3-Pin JST
$2.80  
5 pc(s)
Enclosed battery holder for four AA cells. This holder features a lid that slides over the batteries and snaps into place to fully enclose the battery. It also features a switch that lets you open and close the electrical connection between the batteries and the holder's leads. The leads are...
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-33%
8 x AA Battery Holder - Cube End-to-End
$1.00 $1.50  
17 pc(s)
Battery holder for eight AA batteries with ~140mm leads, cube end-to-end configuration.
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Pololu 5V, 15A Step-Down Voltage Regulator D24V150F5
$83.95  
1 pc(s)
This synchronous switching step-down (or buck) regulator takes an input voltage of up to 40 V and efficiently reduces it to 5 V with an available output current of around 15 A. Typical efficiencies of 80% to 95% along with its high current capabilities make this regulator well suited for...
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Beefcake Relay Control Kit (Ver. 2.0)
$12.50  
1 pc(s)
Your 5V system can wield great power with this big, beefy relay board. How does 10A on the NC contacts and 20A on the NO contacts at 220VAC sound? The SparkFun Beefcake Relay Control Kit contains all the parts you need to get your high-power load under control. Only minimal assembly is...
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-50%
3 x AAA Battery Holder
$0.50 $1.00  
50 pc(s)
Battery holder for three AAA batteries, terminated with ~150mm leads
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Hand Crank Generator
$14.95  
Out-of-stock
This hand-held crank generator produces up to 15 volts of DC electricity. The integrated PCB includes a full bridge rectifier to provide the same output polarity for either direction the hand crank is turning. In addition, other devices can be easily connected to the screw terminal.
Out-of-stock
DC Barrel Jack Plug - Female
$0.50  
39 pc(s)
This female barrel jack plug is great for adding a common connector to the end of wires. This jack is compatible with 5.5x2.1mm barrel connectors. The outer shell unscrews to reveal solder terminals and a crimp strain relief. The outer shell has strain relief as well.
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-30%
Relay SPDT Sealed - 3V
$0.95 $1.35  
61 pc(s)
These are general purpose, Single Pole - Double Throw (SPDT) sealed relays. Use them to switch high voltage, and/or high current devices. This relay's coil has switch voltage of 3V at 120mA. The contacts are rated 10A at 120VAC, 10A at 30VDC. Features : 3V DC SPDT...
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Round Shape 2 x CR2032 Coin Cell Battery Holder - 6V output with On/Off switch
$0.65  
7 pc(s)
This tiny coin cell battery holder is ideal for small portable or wearable projects. It holds two 20mm CR2032 coin cells in series to generate 6V nominal. CR2032 tends to have about 220mAh capacity so this holder would give you 6V @ 220mAh with two cells.
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4 x 18650 Battery Holder
$3.00  
7 pc(s)
Battery holder for four 18650 Lithium Ion batteries, terminated with ~150mm leads
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