Power Management Deals

Anyone working on projects that need to step up a low voltage source to power tubes, relays, or other high-voltage components will find this useful, since it handles a wide 8-32V input range and boosts it up to 390V output. Buy Now at Newegg

Rated for up to 3,000 peak amps, this jump starter handles dead batteries on gas engines up to 10L and diesel up to 8L, which covers most trucks and larger vehicles where smaller portable starters fall short. At $140, that's $70 off the $210 list price. Buy Now at Walmart

Rated at 4,000 amps peak, this jump starter can handle most gas and diesel engines while doubling as a 39,800mAh power bank for charging devices, which makes it a practical tool to keep in your vehicle year-round. At $46, that's $7 off the $53 list price. Buy Now at Walmart

Covers outlets in over 150 countries and includes four USB-A ports plus a USB-C port, so you can charge multiple devices from a single adapter without hunting for local plugs. At $18, that's $12 off the $30 list price. Buy Now at Walmart

Rated at 3,000 amps peak, this portable jump starter handles dead batteries on most passenger vehicles without needing another car nearby, which makes it useful to keep in your trunk year-round. At $38, that's $51 off the $89 list price. Buy Now at Walmart

At $56, that's $134 off the $190 list price for a combo unit that handles both dead batteries and flat tires without needing a separate air compressor or jumper cables. A useful thing to keep in your trunk if you drive solo or do a lot of highway miles. Buy Now at Walmart

Anyone setting up security cameras, LED lighting, or industrial control systems on a DIN rail will want a dependable power source like this, and the 4A output gives you enough headroom for multiple connected devices without overloading the supply. Buy Now at Newegg

Costco has the KT1 4,000A 150-PSI Jump Starter and Air Compressor for $52, which combines a portable jump starter with a built-in tire inflator in one unit. That's $168 off the $220 list price, or about 76% off, making it one of the steeper discounts we've seen on a combo unit like this. Buy Now at Walmart

Handy if your existing power adapter cord doesn't reach the outlet, since the extra length gives you more flexibility in setting up your device without needing an extension cord. Buy Now at Newegg

This inverter suits anyone running power tools, small appliances, or charging devices off a vehicle battery during road trips or job sites, with the fast-charge USB port covering your phone at the same time; it's currently priced at $330, matching its list price. Buy Now at Best Buy

Handy for electronics hobbyists and DIY builders who need to drop voltage from a higher source down to a stable 5V, which suits powering microcontrollers, Raspberry Pi boards, or other low-voltage components in a custom circuit. Buy Now at Newegg

This 18-inch adapter lets you connect a modern 3-prong dryer cord to an older 4-prong outlet, which comes in handy for moves or apartment swaps where the wiring doesn't match your appliance. At $20, that's $10 (33%) off the $30 list price. Buy Now at Walmart

Handy for job sites or power outages where you need to run small electronics off a Milwaukee 18V battery you already own instead of buying a separate generator, and it's currently $18 off the $90 list price. Buy Now at Amazon

A simple solution for travelers heading to regions that use Type A outlets, particularly useful if you're visiting Japan, Mexico, or parts of Central America where plug shapes differ from the US standard — though worth double-checking the specific outlet type for your destination before buying. Getting three in a pack means you can cover multiple devices or share with travel companions without hunting for extras. Buy Now at Newegg

Useful for anyone running 12V accessories in a vehicle or system that operates on a higher voltage, as it steps down the input to a stable 15A output without the energy loss you'd get from a resistor-based solution. Buy Now at Newegg

Useful if you're running sensitive electronics like medical equipment, audio gear, or anything with a motor off a 12V battery, since pure sine wave output won't cause the interference or damage that modified sine wave inverters sometimes do. Buy Now at Newegg

Update: The price has changed to $41.99 since this was originally published.

Handy for road trips or emergency setups where you need to run laptops or small electronics off a car battery without frying sensitive electronics, since pure sine wave output matches what you'd get from a wall outlet. At $38.93, that's about $3 off the $41.99 list price. Buy Now at Amazon

Useful if you need to step down a 12V power source to 9V for electronics projects, car builds, or powering devices that don't match your available voltage. Buy Now at Newegg

Useful for electronics hobbyists, engineers, or anyone building or repairing circuits that need to convert AC power to a stable DC output. Buy Now at Newegg

Anyone replacing a lost or fried power adapter for a specific device will want to check the voltage and plug size before buying, since this covers a wide range of common electronics without paying brand-name prices at Newegg. Buy Now at Newegg

A solid pick if you need a reliable replacement power supply for a 12V device, whether it's a router, camera, or other small electronic. Newegg carries it as a straightforward, no-frills option when your original adapter dies or goes missing. Buy Now at Newegg

Anyone still running an older Tennis Tutor Prolite machine will want a reliable replacement adapter on hand once the original starts acting up, and this one is built to match the machine's original power specs without hunting for a compatible substitute. Buy Now at Newegg

Fits well for anyone wiring up LED strips, signage, or small electronics projects that need a stable 24V output around 250W, since running underpowered supplies tends to cause flickering or premature failure. Worth checking your amperage needs against the specs before buying, but for DIY installs this is a solid backbone component. Buy Now at Newegg