Mag-Lite 18650 Lithium Battery Adapter
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- เผยแพร่เมื่อ 15 มี.ค. 2019
- Mag-Lite 18650 Lithium Battery Adapter
The alkaline batteries are replaced by one (or two) unprotected 18650, button top, lithium battery. The 18650 provides 3.7 volts compared to 3 volts from two alkaline batteries. I am currently using a 4.5 volt 3 cell Mag-Lite bulb with a single 18659 battery which works quite well, but I intend to replace it with a LED. LED bulbs are available on eBay and are expected to be the bulb of choice.
For this adapter, you will need to be able to machine the front and rear spacers from aluminum or brass. The dimensions are given in the drawing uploaded to Thingiverse.
The 3D printed adapter holds the battery and spacers in the correct positions and acts as an insulating sleeve. The adapter, with front and rear spacers, provides positive contact with the Mag-Lite switch contact and the tail cap spring.
I expect the 18650 will hold its charge (unused, sitting on the shelf) 6 months or longer.
I have designed adapters for 2C, 2D, 3C and 3D Mag-Lite Flashlights. The 3C and 3D adapters hold two (2) 18650 batteries. To avoid confusion, each adapter is listed on Thingiverse separately.
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Creality 3D printer & Accessories: bit.ly/2SsvGhh
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Thingiverse links are listed below.
Robonza’s Laser Cut version:
• Recycle Dyson Battery ...
Thingiverse links are listed below.
Mag-Lite 2-Cell C Size Adapter for 18650 Lithium Batteries
www.thingiverse.com/thing:346...
Mag-Lite 2-Cell D Size Adapter for 18650 Lithium Batteries
www.thingiverse.com/thing:347...
Mag-Lite 3-Cell C Size Adapter for 18650 Lithium Batteries
www.thingiverse.com/thing:347...
Mag-Lite 3-Cell D Size Adapter for 18650 Lithium Batteries
www.thingiverse.com/thing:347... - แนวปฏิบัติและการใช้ชีวิต
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Check out Robonza’s Laser Cut version:
th-cam.com/video/HNT3EjHA75U/w-d-xo.html
I like your adapter design. Quite simple actually. The spacers - especially the rear spacer - keeps the tail cap spring from pushing and twisting directly on the 18650. The maglite tail cap springs can be quite strong. Good video. Thanks!
Fellow machinist great idea. I used some PCV pipe to convert 26650 lights to 18650 with these shortages.
This makes me nostalgic for some of my old Mag Lites. They're long gone now (not really sure where they got off to) and bigger+better things have come along, but maybe I'll keep an eye out at yard sales. That said I do have a few 3C cheapie flashlights something like this could be fun for.
I too have a Sherline lathe and mill.. I’ve owned my set for yrs.! I have a number of these flashlights hanging around that I don’t use anymore because they were so power hungry. Been thinking about investing in a Creality, too, as they’re really not that expensive... You Sir, are a genius!!
Thank you for your comment. Glad you liked it. I will be working on an 18650 protected version in the future. The Creality Ender 3 Pro has proven to be large enough to make nearly everything I want. I removed the magnetic print surface and now use the Ultrabase Black Carbon Silicon Crystal Glass for the print surface on my Ender 3 and Ender 3 Pro. I have links (and sometimes coupons) in the descriptions for my video reviews and projects. Please Subscribe! Ron
I stopped using Alkaline batteries for anything years ago, for the same reason you cite: damage from leaking batteries. I use NiMH to replace them whenever and wherever I can, but I love your solution here. I wish that I could give you more than just one "thumbs up"!
This is an elegant solution! Time to learn the lathe!
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Thanks for the drawing made machining simple.
Glad you liked it. I will be working on an 18650 protected version in the future. Please Subscribe! Ron
Great idea! I've got one I can convert. Thanks for sharing!
i love it.... i would so do this if my giant mag light hadn't corroded so badly the battery's won't even come out. I have become a huge fan of the cheap led head lights that use 18650s there weird to get use to but so nice having both hands free.
It's nice to have the metal spacers and connectors shown. But don't have a 3D printer or a lathe---I made an adapter made from cereal box chipboard that fits inside the battery compartments of a 2C and a 2D LED Maglite that will hold a single 18650 battery. I then made a spacer that connects to the rear end of the battery to the tailcap spring. The spacer is made of wood with a center drilled hole with a .01" thick strip of aluminum that makes contact between the battery base and the tailcap spring. I have also made an adapter that uses two "AA" batteries (much cheaper and easier to find then C or D batteries). One can use Alkaline or NiHM rechargeables. If you use Alkaline the carboard will absorb any leakage jist as long as the Maglite is stored retsing on its' reflector end.
Thanks, just downloaded the 2 D cell version.
Wish I hadn't got rid of my Maglites now. Over the years my flashlights have got smaller, brighter and longer lasting. I now have a single cell flashlight that fits in my pocket, it's brighter and longer lasting than my old large maglite. Maybe I will find some at a car boot sale for conversion.
You can also put a protected 18650 in there if you allow about an additional 5mm per cell. I ended up with a whole bunch off of Ebay. They're just an ordinary 18650 with a copper strip down one side to a little puck on the negative end then clear shrink wrapped. That way you can give it to someone careless and they can't destroy the cell (s) by dropping them below 3V :)
Man, I wish I had that lathe and a CNC machine... I'd never leave the garage lol
Last year I updated the adapters to use protected cells.
Mag-Lite Flashlight 18650 Protected Cells
th-cam.com/video/W9QltxP6USU/w-d-xo.html
Thanks for watching! Ron
Great idea. This would have saved me multiple damaged flashlights.
I love the 18650 adapter, I hope I was part of the inspiration for that. I need to see if I can make a laser cut version so I can make use of these 200 cells I have sitting here doing nothing.
You need to either use protected lithium batteries or install a protection circuit to prevent batteries from exploding if they discharge too far. There also, needs to be a vent hole incase the batteries vent.
Great discovery! I found by testing that my PR 3V-18V LED turns off and does not draw current below 3V, so it is in effect providing battery protection for 1 cell. If a PR 6V-24V LED was used, then it should shut off at 6V for 2 cell protection. Be sure to test your LED so as not to over discharge the cells.
Ron, I have been using eneloop nimh. Tired of batteries leaking. Especially Rayovac.
I am using Tenergy NiMH everywhere for AA and AAA and have one Mag-Lite with their D cells. Obviously a 3 Cell or larger Mag-Lite is a formidable club, but otherwise lighter is better and the rechargable D and C cells are a bit expensive and very heavy. The 18650's are widely used and if handled carefully perform very well. I received my first LED bulbs from China last week and a 2 Cell Mag-Lite now looks like a Surefire.
The thingiverse links need to be fixed. The thingiverse number is followed by "/edit" which takes you to the end of thingiverse.
Great video. I might have to try this with flash lights other than Mag-Lites.
Thanks for that... wonder where the "/edit" came from. Links are fixed now and have been tested. Ron
Great idea! I currently have two or more D-cell LED maglites with corroded batteries stuck inside. Any way to get em out?
You could try soaking in kerosene or diesel probably followed with a hammer and chisel... it would be a lot of work and then the switch assembly will need to be replaced. Generally cheaper (and easier) to buy a new one. Thanks for watching.
Would it be possible to double up the 3d cell to work inside a 6 cell maglite
Two of my 3D cell adaptors should space out the same as 6ea D cell batteries. The problem then becomes the voltage.
Two (2) of my 3D cell adaptors would hold four (4) 18650's which would be 14.8 volts.
Or you could try three (3) 18650's (with different aluminum spacers) which would be 11.1 volts.
The LED bulbs for converting the MagLite flashlights tend to be 4-12V or 6-24V and then there are warm white and bright white bulbs (so you need to look around on eBay or wherever). Then you would need to decide which bulb you think you would like best... or experiment with different bulbs and voltages.
Unfortunately I do not have a 6 cell MagLite otherwise I would have done this already. Since a 6 cell MagLite is sorta like carrying around a baseball bat, I never had one.
If you know how to do CAD, I would try making two adapters that screw together to hold 3 or 4 18650's with an aluminum adapter in each end. A single length adapter is probably too long to print on my 3D printer (Ender 3).
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Ron
Sounds (from comments) that people like the 18650 batteries. Why?
What led bulbs should we get to replace a standard flashlight bulb if we switch to 18650?
Thanks for the video and your fix.
The 18650 lithium batteries are being used in a lot of things and the price has come down quite a bit. They are used in laptop battery packs and other cordless applications like vacuum cleaners. They are apparently also used in the vapor e-cigarette things. I have received the 3V LED bulbs for Mag-Lite from china and have been running them on a single 3.7V 18650 and so far they are working and produce a very bright white light. I have some 4-12V warm white LED bulbs ordered for the 3 cell’s with two 18650’s but they haven’t arrived yet. Look around on eBay for Mag-Lite LED conversion bulbs and make sure you are getting the correct bulb base for your flashlight.
Ronald Walters Thanks Ron
Good day. The fact of changing 3 D-type batteries for 2 18650-type batteries strikes me because of the voltages they handle. 3 D type batteries add up to a total of 1.5 * 3 = 4.5 volts and two 18650 type batteries add up to a total of 3.7 * 2 = 7.4 volts. Be careful, the led can support that voltage and nothing happens, I don't know because I haven't done the test but the difference is quite considerable. Greetings.
If you read the description for this video, it addresses the use of a 3-cell Mag-Lite bulb with the single 18650. You could use a 5-cell Mag-Lite bulb with two 18650 batteries but it would be a bit dimmer than a 5-cell flashlight with fresh D cell batteries. LED’s are easily found on eBay and you would need to decide if cool white or warm white is your preference. The LED bulbs do handle a much wider range of voltage than a Mag-Lite bulb, but you do need to pay attention to the listing before ordering.
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Ron
@@RonaldWalters2010 Ron thanks for your answer. I tell you that the flashlight itself has an LED lamp (not a filament bulb), but it works with 3 D-type batteries and hence the change that I am evaluating.
Fair enough... I have never had a Mag-Lite flashlight that had an original LED bulb. Mine have been filament or halogen bulbs. Ron
The problem I see with this is two fold (one you touched upon) and they are #1 10-12000mah vs 2200-3000mah. #2 4.5V vs 3.7V.
Most lithium-ion cells are 4.2V max and an alkaline cell is 1.5V max. A rule of thumb, 3 NiCd or NiMH cells equal 1 Li-Ion cell in voltage range. 1.0V-1.4V max x 3 is 3.0V-4.2V. Power tools 5 lithium cells equals 15 NiCd/NiMH.
If you use 2 lithium cells to double the voltage, the current draw will be half, so the alkaline will be twice (instead of four times) the capacity. Replace the incandescent lamp with an LED lamp and you will increase efficiency.
Have you ever looked into the 6 D Cell Maglite conversion?
Unfortunately I do not own a 6-cell Mag-Lite so I never played around with that conversion. My D cell adapters are designed to hold one (or two) 18650 batteries.
A 6-cell Mag-Lite is 9 volts. Using three 18650's would give you 11.1 volts. Some of the LED bulbs are rated 4-12V. I HAVE NOT TRIED THIS but... you may find you could use a combination of a single 18650 and a double 18650 adapter inside the 6-cell Mag-Lite and adjust the aluminum spacers accordingly.
If I had a 6-cell Mag-Lite that is what I would try first because a single longer adapter for three 18650's may be too tall for some 3D printers.
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That is what keeps this channel going.
Ron
@@RonaldWalters2010 After I asked the question, I also did the voltage/cell number math and got discouraged. But I was not aware of the wide voltage range of the LED bulbs. I'll look into it further. Thanks for the reply and keep posting!
@@RonaldWalters2010 . . .A 6-cell Mag-Lite is NOMINALY 9 volts and practically 7.2 volts. Voltage of pair 26650 will light up 6D cell bulb perfectly with lot of run time.
Ever clean out a damaged Mag flashlight after Alkaline batteries leaked. Any success? Worth doing?
You did not say what size flashlight. If an AA or AAA I think I would just throw it away. I used to check batteries every 6 months, which was not often enough. Then switched to every 3 months. Murphy's Law dictates the batteries will start leaking immediately after you checked them. I have had D cell Mag-Lite's that looked like the batteries were installed with cement. Leakage got into the switch and locked everything solid. You need to gently remove the rubber switch cover and use a allen wrench to loosen the switch (there are several youtube videos on doing this). If the switch does not want to loosen, try soaking in WD-40 and gently work the allen wrench back and forth to get it to loosen up. If bad enough you may need to drive the switch and the batteries out with a wood dowel (exiting the tail cap end). You still need to loosen the switch with an allen wrench before attempting to drive everything out. Soak the tube in vinegar and scrub everything clean with soap and water. A wood dowel with emery wet or dry can help clean the inside of the tube. Wear disposable gloves when messing with the leakage. New switches available on eBay for $8 - $16 look for the best deal. Either use rechargable NiMH batteries or make my conversion for 18650's. Either way, get one of the LED bulbs out of china (again eBay) and you will have a very bright flashlight. Worth it? That's up to you and if you just like to fix stuff. I am a big fan of SureFire flashlights and 123A lithium batteries... BUT... I still like a flashlight that fits my hand and the Mag-Lites will be around for a long time. Thanks for watching! Please Subscribe… that is what keeps this channel available.
@@RonaldWalters2010 Personally I think they are worth fixing. It's the challenge! Better than contributing to the landfill.
@@RonaldWalters2010 Use white vinegar, it starts dissolving the corrosion immediately. Alkaline vs Acid = reaction. Let soak for about 15-20 minutes then remove the rear spring, put cap back on and bang the flashlight on a piece of softwood. The stuck batteries will come out easily.
Rinse with a little baking soda and water, then dry and reassemble with new batteries.
have you ever made an adapter for 18650 to 6 volt lantern battery
Sorry, I have not.
@@RonaldWalters2010 appreciate the response love all the vids.
Where can i buy 3D cell convertion adapter???
You need to make them yourself. The 3D stl files are free on Thingiverse. Link is in the video description.
I have no 3d printer but i found one on ebay 😃 thank you for your fast reply
I have reviews on the Ender-3 and Ender-3 Pro. In the video description are links and discount codes if you are interested.
Nice be better if u used copper adapter pieces instead of aluminium
I use a carriage bolt with fender washers sandwiched at each end. Put the cell(s) in first and then the bolt assembly head-first so the nut goes into the cap spring.
With these thick tubes a rather would take 21700 or 26650ies !
can I buy this adapter somewhere?
No. You would need to make it yourself.
Thanks for watching!
Some sell these on ebay.
26650 battery has a lot more capacity compare to 18650
would you be willing to sell me one?
Sorry, you would need to make your own or have a friend do it. The files are available for free on Thingiverse.
I will just go and buy a lath then to turn some aluminium down to fit!!
Might want to machine it from Delrin (which machines beautifully) or some other plastic so you don't make a potential short circuit. Short the case of an 18650 to + and it will spoil your whole day.
Thanks for watching. Please subscribe!
That is what keeps this channel going.
Ron