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These will make great little batteries for portable projects.  They seem cheap enough online as well, they are LG branded batteries.

 

Anyway, search "lgdbmg11865" to get these batteries. 

 

@Windows7ge Tagging you again, although I think that you already found them.  Sorry if my tagging you is bothering you.

  1. Windows7ge

    Windows7ge

    You're fine. I had the idea to use a pair of 18650's in tandem with a MT3608 to run a fan at 5 or 12V. Thought of using the 3D printer to create some custom mounts that'd allow me to strap one to each side of the fan and screw it down using the existing hole mounts. It'd make a great stand so it doesn't fall over while giving it some weight so it doesn't go anywhere.

     

    No idea what I'd want a battery powered fan for though.

  2. Skanky Sylveon

    Skanky Sylveon

    @Windows7ge Summers are hot, so a portable fan would be useful. 

     

    I am also working on a raspberry pi infared point and shoot camera, so I have multiple uses for them.

  3. Windows7ge

    Windows7ge

    Still related to hobby electronics, my dad keeps buying those cheap solar garden lights but they keep crapping out. Either not enough sun, the solar panel wears out, or the batteries corrode.

     

    I keep trying to convince him to let me gut them and run constant DC from a computer PSU out to them. Bury the wires and put the PSU on a timer. Then they'll be full brightness every night from dawn to dusk. I know DC hates long distances so I'd have to boost it but again, a couple of boosters would fix just that.

  4. Skanky Sylveon

    Skanky Sylveon

    A boost converter would fix any voltage drop from distance while using DC, that is, if you have the extra wattage required. 

     

    I honestly find the little solar lights to be tacky, but the solar panels can be scraped if they still work, a multimeter can be used to test them.

  5. Windows7ge

    Windows7ge

    To drive a few LEDs I'd expect any PC PSU to have enough current on which ever rail I want to use to run as many as I like using a cheapo booster.

  6. Skanky Sylveon

    Skanky Sylveon

    @Windows7ge Any crappy PC PSU would do fine.  You may not need to use a boost converter if you use the 12v rail and the appropriate resistor, or buck converter. 

     

    Actually, I wonder if those cheap LEDs have resistors wired up.  If not, then that would explain a lot.

  7. Windows7ge

    Windows7ge

    The lights only run on 1.5V so although 12V would equal more cable distance than I could ever need I'd probably still have to regulate it with a step-down module like a LM2596

  8. Skanky Sylveon

    Skanky Sylveon

    @Windows7ge Hence why I said that you may need a buck converter if you use 12v.

     

    If 1.5v is all that they need, you may get away with 5v though. 

  9. Windows7ge

    Windows7ge

    Ah, I play with hobby electronics but I don't have all the terminologies down.

     

    I'd like to at least test the feasibility of it so I'm trying to get him to throw one at me he considers "used up". I figure, remove the battery, snip the leads to the solar panel, solder some leads to the battery terminals, tune the buck converter and it should work a treat.

  10. Skanky Sylveon

    Skanky Sylveon

    @Windows7ge Don't worry about it, I don't get the terminology right often as well.  But buck/ step down can be used interchangeably, as well as boost/ step up.

     

    And yeah, in theory that should work, it would still be in your best intrest to put a resistor on the positive or negative part of the LED though.  Even if you have the right voltage, fluctuations in current can still fry it, and a resistor mitigates that.

     

    Not sure if you have the money for resistors though. 

  11. Windows7ge

    Windows7ge

    The website I buy the stuff from is crazy cheap but I have to wait about a month for the parts to show up. I have a box full of goodies. Cost me about $100. If I know what value resistors I need getting them cheaply shouldn't be hard.

  12. Skanky Sylveon

    Skanky Sylveon

    I just buy a variaty package, there should be a calculator online that gives you the best resistor value for your particular LED and voltage value @Windows7ge.

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