1275 How To Convert Old Phone Batteries For 101 Uses 

thank you mate and yes the edit was needed for sure

The best teacher!

@@ThinkingandTinkering Agreed, good call. :)

Teaching how to learn, and learning together!. Something the Education system should do, instead of teaching us what to learn!

good point mate - thanks for the tip

18650! That's quite a lot and sound quite interesting. Have you uploaded the video somewhere? I can't see it on your channel.

awesome mate

@@ThinkingandTinkering Robert words cant describe how awesome you are.

If you have a look at the datasheet for those little boards, you can change a single resistor to set the charging current to anywhere up to an amp, IIRC they come set at 500mA. From memory it's up to a 20k resistor, I have one with a pot on it so I can easily change the charge rate. The chip also supports a thermal cut-out which I've never tried.

He mentioned on the video that he removed the original controller and connected the raw battery to the new charging board.

Thank you! Cheers!

Yes. Check AliExpress or eBay. "tp4056 type c" should fetch you good results.

oh also as most things that use standard batteries, also are designed to allow using rechargable like cadmium sulfide, metal hydroxide ect, which means the voltage is 3 x 1.2v not 3 x 1.5 only, so 3.6 is perfect for those, it seems.

You'll get current flowing from the "bigger" one to the smaller one. This isn't a good thing as you're wasting power and may cause overheating, so you try to use matching ones. Also even if you do have 2 matching ones, make sure the have the same amount of charge when you solder them together. It's a bit safer if you discharge them first.

@@j.f.christ8421 Thank you!

@@john_blues I should add my answer was for parallel. Basically if they're at different voltages then the 'bigger' one will charge the 'smaller' one until the voltages equal each other. When discharging & charging they'll do that as well, which may overstress the smaller one. In serial is a bit different, but the voltage on the 'smaller' will drop faster (probably dropping below the safe voltage) while the bigger one is still forcing current thru it. This is why dead battery packs (even back to the old NiCAD & NiMh ones) will have one dead cell, that's the weakest one failing first and killing the pack. This is why LiPo packs have the balancing & protection circuits. Finding matching cells is why those battery capacity testers are quite popular these days.