9V battery to Rechargeable 14500 Li-ion battery hack: Never buy 9V battery again

9V batteries are hands down the most expensive batteries out there. Replace it with 14500 Li-ion batteries and you'll never have to buy 9V batteries again.

[JohnClulow]

Does the 14500 mod you described have any significant advantages over the rechargeable Li-ion 9VDC batteries offered on Amazon in a std 9V case?

[himeccms]

Wow! In all the time that I dealt with almost every form of consumer batteries, Ihave never realised that the AA is the same length as a 9V

[tims]

I have an indoor/outdoor thermometer that eats batteries really fast. It takes 2 AA cells in series. It won't work well with rechargeable AA cells because the voltage is too low with those. I put a 3 cell parallel 18650 battery holder on the bottom. Made some dummy cells out of wood dowels with sheet brass terminals placed into the battery compartment and soldered the wires from the battery holder to those brass terminals. It lasts for months now. The nice thing about it is that I can swap the cells out at any time.

[christophernalbone]

I use 2032 coin size batteries stacked in seires. 3 volts times 3 equals 9 volts. Then use a 9 volt battery conector with leads. At the end of the leads solder on ring connectors and place the connector on the batteries. Red to the top and black to the bottom. Slide a piece on heat shink tubing over it and shink it tightly. Now you have a battery that will fit in any compartment. You just have a lower capacity.

[crumblenaut]

Excellent! Thanks for showing different devices, and ways of connecting them.

[xXDannySilvaXx]

Ive been doing this to alot of my electronics. In fact I just did this to my multimeter because I didnt have any 9v batteries. Lithium batteries are so cheap and so useful.

[adus]

Disposable E-cigarette batteries are good for that sort of thing. Sometimes you find them in the street. There actually lithium ion batteries inside

[williammchugh]

I've retroed a few different devices with various Lithium cells and often just solder in a universal power connector I use which matches an Imax B6 hobby charger. The only disadvantage I see is that without a BMS, it is very possible to over-discharge the cells if you are not careful -which can damage the cells. It happened to me on a pet's toy. After that I try to use a BMS if only to protect the cells from being totally discharged (unknowledgeable people often use what we build). Again, enjoyed your work Vuaeco. BTW: The price of D Cells are totally outrageous.

[maukaman]

You probably know this already but you can charge multiple series connected cells with more than one TP4056 if you power them from separate usb supplies. I use this trick for balancing and restoring power tool packs all the time, now I have a whole bunch of working 18v Milwaukee packs and I didn’t buy a single one of them! 😁
🤙

[matip]

5:00 Worst problem is that positive terminal can be shorted with negative terminal by magnet and caused fire (that magnet which is in positive terminal because all battery case is negative terminal

[mwint]

What about low voltage issue? Draining it below X volts is bad, no?

[skyisthelimit]

Thanks, very informative video. Where do you get these small magnets? Let me know please Thanks

[jeremiahbullfrog]

This is brilliant! i never heard of these cells, thanks for the info

[daveb]

This is excellent information, thank you. I would like to make an 8.4V battery with Balance BMS.
Could you please recommend which BMS would be appropriate for charging both of the 14500 cells at once?
Thank you for any info you can provide. Love your channel!!

[alizawwad]

I enjoy watching your videos :), thanks and keep up the good work, quick question though, why don't you just buy rechargeable 9V batteries, it is available on the market and charged using micro USB cable, you may mount a port on the side of the cases so you don't have to open them every time you need you need to charge them!

[mathewrtaylor]

Thanks for this video, super helpful! This and your previous video on the 14500's are great, and I just ordered a batch because of your last video. I watched a video of yours talking about recovering batteries from battery packs. The limited ones I have done (both laptop) have all been 18650's. Are there known packs to you can consistently recover 14500's?

[TrevorSachko]

3.7v, chuckles. Use a 9v rechargeable...

[garrettgiuffre]

Thag magnetic ideas great. I can't believe I never knew about that. So using it

[khoahatake]

Where do you buy the cables for balancing from?

[christopherleubner]

Multi testers make more sense to use the disposables, if you got something that drains them quick then rechargible is better.