LVC/LVA for a 1 Cell LiPo?
 

Hey guys, I have a quick question.

Since I'm making a USB charger, I was thinking of using a single cell lipo, over 2 or 4 double A's.

Using a single cell lipo to power a USB charger directly would surely be moe efficient an last longer than standard AAs.

Now if I DO use a single cell, is there any way I can mod, or pick up a LVC, afterall, I don't want something smoking on me during class, nor so I want a puffed lipo in class! :lol:

Any help/suggestions/advice would be appreciated!

Shaz-zam:

http://www.batteryjunction.com/prcimopcbfor.html

Wow, didn't see that.
But what the hell do I do with that :neutral:

Is this USB charger for powering your laptop? If so, why not use A123 cells? You could buy a 15Ah prismatic for $37 + shipping and that could go in your bag with a few heat shrink layers on it for protection, or even some stiff rigid plate for added security?

Not a laptop charger, but rather a USB charger for little things, like my phone, iPod, etc...

That PCB is wired between the LiPo battery and the device, and it acts as a voltage/amperage traffic cop, stopping the LiPo from over-discharging or doing exactly what you don't want it to do.

If you take apart certain Lithium batteries for things like cell-phones and audio-devices, you almost always see a similar PCB wired to the battery to keep it from over-discharging or over-charging.

The PCB linked to above is EXACTLY what you need.

I meant more along the lines of what to solder it to (Positive to ?, Negative, etc.)

It will come with instructions, but it is pretty self-explanatory...

http://ep.yimg.com/ca/I/theshoreline..._2106_58772718
http://lib.store.yahoo.net/lib/thesh....7vpcb8.5A.jpg

So I would assume, the left, bigger pad is for the positive, right side is for the negative side, what's the middle for? Just a different cable to charge?

If it's THAT simple, I'll definitely be trying this out..

Remember, it is used to make sure the battery is not over-charged, or over-discharged...so, that's why there are three pads. Two are positive (+) and one is a common ground/negative (-).

The circuit lies between the negative batt and negative load&charge, both the batt + and load + are connected to the same contact point.

Ah, but my real question is where are the polarities, and such?

Is the far left both positive and the right is the ground?

The top part of the diagram is your battery, the bottom part is the wires going to your charger circuit. B+ is battery positive, and so on.

Okay, so the B+ is battery positive, B-, battery negative, P+/- is...

yeah, I'm dumb.

The wires going to the charger circuit.