Converting flashlight batteries into mobile power supplies

Old lithium ion batteries - many of us have them laying around. And in most cases there is little use for them. In my previous ible and video I showed you how to use them as a powerbank, today I will ...

Industry
May 08, 2026

Battery Adapter for Ryobi 18volt One+ P107 P108 Li-ion Battery

Features about the USB Battery Adapter. 1 pact size and light weight,that could be put into backpack or tool box,will not occupy much space. 2.Utilize your 18v cordless power tool batteries, convert your lithium battery into

Industry
May 05, 2026

Battery Adapter for Black & Decker 20V Power Tools

【MULTI-FUNCTION DESIGN】 This USB battery converter is not only as a light, but also could be as a portable power bank for charging your USB electronic devices,easily convert battery to mobile power source,

Industry
Feb 03, 2026

Turn Cordless Tool Batteries Into USB Chargers

Tool manufacturers are tapping into the market of repurposing old batteries for charging mobile devices. I predict that LED flashlights and USB charge ports will come in the batteries in the

Industry
Jul 26, 2025

Using e-bike battery as a power bank : r/diyelectronics

Hey, i am a bit late to the topic, but i have a question, i have a high capacity battery with a pretty good BMS, it doesn''t have any ports for charging other stuff, its purely designen for a E-bike, my idea is making a big power bank, with USB Ports and normal electric outlets, to charge stuff etc.

Industry
Aug 26, 2025

Is it possible to convert this old flashlight to take an led

Especially compared to todays tech. The biggest limitation is the giant, heavy, impotent power supply - alkaline batteries. If you are using it as a baton, they literally make a beater stick with a rechargeable li-ion flashlight built into the

Industry
Jun 12, 2026

Flashlight Battery Power: Does It Have an AC Current or Just DC?

These factors significantly influence the overall efficiency and longevity of flashlight battery power. These alternators convert mechanical energy into electrical energy with alternating current. In contrast, DC generation can result from batteries or photovoltaic cells, which produce consistent direct current. Voltage Supply: Most

Industry
Mar 24, 2026

Battery Conversion for LED Light : 4 Steps (with Pictures

Plug the leads back into the power supply and take it from the minimum the original power supply gives out, up to your target voltage. Good. It works. In truth, I doubt this would ever be a problem. If you don''t have a power supply like this, or a multi-meter, skip this step.

Industry
Jan 07, 2026

converting new blow molds from battery : r/blowmolds

Sorry to bump and old thread, but if you''re looking to keep the LED and are using the blow mold indoors, then you can get a power supply adapter to go from AAA to a plug. I''ve purchased a few on Amazon from a company called Lenink and they work great to convert my smaller indoor blow molds from battery to plug.

Industry
Jun 24, 2026

How to Make Almost Any Lamp Cordless | Pneumatic

I''ve finally come up with 3 different options to convert a standard corded lamp into a portable, cordless lamp. Each can be installed in the lamp of your choice in less than 5 minutes. Watch the full video tutorial to see

Industry
Jun 13, 2026

Converting a battery powered LED strip to a cord

This power supply does not appear regulated and will most likely deliver closer to 6 volts under the light load of your leds. The LG power supply lists 5.1 and seems to be regulated. I think I would use the LG power supply. To get power out of these units you will either have to cut the plug off or get a matching plug.

Industry
Jan 27, 2026

Harbor Freight 1250 Lumen Lantern and converting to 18650

The battery compartment is VERY spacious at approximately 100x100mm. The circuit board inside appears to be a simple pwm circuit for dimming. So the first thing I did in order to convert it was to try to power it with my bench power supply to see what kind of voltage range it would take. Theoretically the four D cells should put at about 6 volts.

Industry
Jan 01, 2026

Convert D cell -> AA? | Candle Power Flashlight Forum

My last D cell lights are a 4D Mag and two 2D Mags. To simplify hurricane preparations and supplies, all of our other lights and electronics use either AA''s or CR123A cells. While researching Eneloops, I saw they had a D to AA converter that appeared similar to the one at Battery Junction...

Industry
Jan 08, 2026

Convert 6 volt Lantern to LED?

Hello everyone! First post here. Just getting into high power LED flashlights and interested in getting started with a few D.I.Y. mods. I have a Rayovac 6volt Lantern (the cheapie plastic floating lantern that utilizes those large 6 volt lantern batteries. I''d like some ideas to mod it to an LED floodlight. I''d like to have it "flood" a large area with light at the expense of throw. It

Industry
Sep 03, 2025

Converting a sconce to battery power : r/askanelectrician

The other module is simply a power supply for them. You likely can connect a grounded cord to the power supply and case of the fixture. But that supply is not UL approved. I would snip off that supply and connect what 12V1A plug in supply I have

Industry
Jul 30, 2025

How to convert battery to plug in

Buy Lenink 1 to 3 AC Power Supply Adapter Kit with On/Off Switch for AA Battery, Replace 3 AA Battery: AC Adapters - Amazon FREE DELIVERY possible on eligible purchases Reactions: tdj7777, halloweenscreamqueen, Kdestra and 1

Industry
Feb 10, 2026

How To: Convert a light from AAA Batteries to USB Battery pack!

Follow along as I convert a AAA battery powered camping light to a rechargeable USB battery pack powered light! Think it''ll work?I bought some of these great...

Industry
Jun 17, 2026

I want to dive into this hobby by converting this battery powered

Important thing about batteries in an electronics context: they''re pretty much never the voltage they are marked with. 1.5 V alkaline batteries are the worst of them all, being anywhere between 1 and 1.5 V, and spend most of their time sitting at 1.3 V ish. That means something made to work with such batteries will be very tolerant to varying supply voltage.

Industry
Oct 23, 2025

batteries

I want to convert a LED light that uses 2 AA batteries, to AC power supply. I have 3 of these lights. I''m assuming each light uses 3V for a total of 9V. I have a 9V AC to DC 2A power adapter. How should I wire this? Would

Industry
Jun 01, 2026

How to Convert a Lamp to Battery Power? Cordless

Several methods exist for converting light to battery power. Utilizing a battery-powered light is one option. These lamps use batteries to transform electrical charge into light. Another option is to use a solar-powered

Industry
Mar 21, 2026

Make a Powerful Rechargable Flashlight Out of a Used Battery

I discovered that the 14500 battery is AA size and physically fits the flashlight case lengthwise. As a bonus, they can also use the same charger as 18650

Industry
Oct 22, 2025

Battery Adapter Compatible with Milwaukee 18v Battery USB

Compatibility: The adapter is compatible with MK 18V lithium battery, converting your battery into Mobile Power Supply System (Battery NOT Included) USB Port/Type C port:

Industry
Jun 19, 2026

Converting 2/4/6D maglites to rechargeable torches

Do you speak of a light that can be charged with battery inside? A rechargeable "pack" outside the light? Currently folks use rechargeable cells in their typical battery charger and place them charged back into the light inside

Industry
Aug 05, 2025

18v to 6v conversion : r/ryobi

What you could do is take your old charger and cut out all the electronics on it. Keep the wiring that goes up to the battery terminals. Solder those into the input side of the buck power convertor. Adjust the screw on the power supply to show 6v on the output.

Industry
Jun 30, 2026

Converting flashlight to AC power and plugging into an arduino

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Industry
Nov 29, 2025

Converting Computer Power Supply to Battery Charger

A modification to convert an old generation ATX or older AT computer power supply to a 4AH..100AH battery charger. You can add a TL494 controlled module to the power supply and make a high power charger that works very well after a few tweaks. The output voltage of the circuit can be adjusted between 10.6v.17v and the current is 0.22ma.

Industry
Mar 07, 2026

Converting 2/4/6D maglites to rechargeable torches | Candle Power

Do you speak of a light that can be charged with battery inside? A rechargeable "pack" outside the light? Currently folks use rechargeable cells in their typical battery charger and place them charged back into the light inside of a space filling tube of some sort. I believe a battery pack of some sort would be well received.

Industry
Mar 04, 2026

Convert Mobile Charger into Power Supply

In this step-by-step tutorial, you''ll learn how to transform a standard mobile charger into a versatile power supply for your electronics projects. Whether y...

Industry
Mar 02, 2026

Tutorial

The third phase will be getting a 1000 watt 24v DC power supply (large) and a step-down transformer to get us at 20 volts (assuming Milwaukee didn''t give much headroom on the electronics for a 24 v circuit). While yeah, the power supply will be large, i expect only the larger stationary tools to need that, so the size won''t be an issue.

Industry
Jun 03, 2026

Converting a battery powered device into a solar powered device?

Better to use drop in rechargeable batteries, or convert it to a rechargeable higher capacity pack. Solar "charging on the go" isn''t really a time or space efficient thing yet. Sure they make solar phone chargers but those also have lithium packs since it would take forever to charge a phone off the little 5-10W solar module..

Industry
Feb 24, 2026

Convert a Flashlight From AA to Lithium Batteries

The batteries that I want to use for the torch are removed from an old laptop battery and they came in packs of two parallel 18650 cells. I wanted to use both of them so I can get a lot more use time out of the torch, so I started removing pieces of

Industry
Sep 15, 2025

How to Convert Battery Operated Lights to Plug in

Uninterrupted Power Supply: Learn how to convert your battery-operated devices to plug-in using innovative battery adapters. Say goodbye to the hassle of changing batteries frequently and enjoy uninterrupted power for up to 24 hours.

Industry
Apr 03, 2026

From Battery-powered to USB Christmas Lights

I''ve converted a string of micro LED fairy lights powered by 2-CR2032 3V batteries to run off of a 5V 1.0A Switching AC/DC Power Adapter. The lights are "Steady On" when powered by the batteries, but flash off & on at

Industry
Jul 09, 2025

converting LED holiday lights to battery power

There are some holiday light strings that are wired in parallel with a step-down power supply to run them. That''s the kind of set that you could adapt to battery power without rewiring the whole string. I don''t know where you are, but in the US there are several craft store chains that sell small battery powered LED holiday light strings. They

Industry
Feb 03, 2026

Battery Flashlight: How It Works, Simple Mechanics, And Physics

Battery flashlights operate through electrical circuits that convert stored chemical energy into light energy. The main components involved in this process include the battery, the bulb, and the switch, which work together to create a complete circuit that powers the light. Battery: The battery acts as the power source.

Industry
Mar 25, 2026

Convert a Battery Powered LED Lamp to USB Power.

NB: if you want to retain the ability to use a battery in your lamp, you''ll need to omit the part about disconnecting the battery terminals. For my purposes however, I didn''t care about using the battery capability any further. So using the soldering iron I desoldered the connections from the battery holder to the circuit board.

Industry
Nov 14, 2025

Converting AAA battery powered LED lighting array

I want to convert the array to plug into a nearby 110v AC outlet by wiring it up to a compatible transforming power adapter (brick) I will be repurposing for the project. Please note that I have MANY of these bricks to choose from and if I do not

6 Frequently Asked Questions about “Converting flashlight batteries into mobile power supplies”

How do I convert a battery-operated Christmas light to a USB power supply?

To convert some old battery-operated Christmas light to work with a USB power supply we need: Tools: Battery-powered lights are pretty much all made the same way: they have a little box where there is space for the batteries and a circuit with the switch, and from this little box the wire with the lights starts.

How do I convert battery operated lights to plug-in lights?

Convert battery operated lights to plug-in using a wall power adapter. Here's a guide on how to do it, reducing battery waste and save money.

How do I convert a corded lamp to a battery?

Check them out below! The fastest way to convert a standard corded lamp is to purchase a rechargeable lithium power bank with a build in AC-DC power inverter. Here in the United States, the electricity that powers our homes is typically 110V AC, or Alternating Current. Batteries output DC, or Direct Current electricity.

Can a USB light run on 3 batteries?

By using one voltage regulator we can also power multiple light strings running with the same voltage by connecting them in parallel, so - with - and + with +. When I plug in the power supply and turn on the light switch we can see that the lights work as before. Now let's see how to transform to work with USB lights that run on 3 batteries.

How do battery powered lights work?

Battery-powered lights are pretty much all made the same way: they have a little box where there is space for the batteries and a circuit with the switch, and from this little box the wire with the lights starts. Generally 2 or 3 batteries should be put in the battery holder. Let's start with a light string that works with 2 batteries.

How do I connect my lights to a USB power supply?

The contacts are positioed like shown in most of the cases. However always look which contacts are connected where to individuate the right ones, as their order may vary. To connect the lights to a USB power supply, such as that of a phone, we need an old USB cable.

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