Crazy battery question...

[t3hp00ky]

So I'm looking into adding an internal charger to a nicostick, like I've said in an earlier post. I've been looking around online, and all I see is the hazards of doing this wrong.

So the question is; If I'm using a protected Li-ion bat do I have to build some sort of shut-off mechanism so I don't overcharge the battery? Or will the protected bat save me the trouble of having to do this?

 

[Dave Rickey]

Yes. But a MAX1811 or MAX1555 charger chips are cheap and will give you protection on both sides (keeping you from trying to charge with a source voltage *lower* than the battery voltage). Although the example circuit calls for some additional components, they're not really needed and you really only need to make 3 connection (4 if you want to hook up a "charging" led). Really the biggest problem is that the chips (especially the 1555) are so small. Or you can strip the board out of a DigiPower pack and get it all in one nice (pretty small) package, plus a little Li-Poly flatpack for a bonus.

Don't just hook the +5V USB lead to your battery positive and trust the protection PCB to cut it off. Bad Things can happen.

--Dave

 

[t3hp00ky]

Yes. But a MAX1811 or MAX1555 charger chips are cheap and will give you protection on both sides (keeping you from trying to charge with a source voltage *lower* than the battery voltage). Although the example circuit calls for some additional components, they're not really needed and you really only need to make 3 connection (4 if you want to hook up a "charging" led). Really the biggest problem is that the chips (especially the 1555) are so small. Or you can strip the board out of a DigiPower pack and get it all in one nice (pretty small) package, plus a little Li-Poly flatpack for a bonus.

Don't just hook the +5V USB lead to your battery positive and trust the protection PCB to cut it off. Bad Things can happen.

--Dave

By Digipower pack you mean something like this right?

Amazon.com: Digipower BP-NP700 Replacement Li-Ion Battery for Konica-Minolta NP-700: Electronics

 

[cyberwolf]

Another option is a charger board I saw on ebay. I haven't gotten around to ordering one yet, but it looks like it would work well. Unfortunately it's from China, so it will be awhile...

It's referenced in this thread - http://www.e-cigarette-forum.com/fo...hium-li-ion-battery-1-cell-charger-board.html

 

[southener]

If you look at my post on the discussing the nicostick thread you can see that I got made for me that has a charging port on, I just plug it in and don't have to take the case apart. My brother in law made it if your interested I'll ask him how he did it as it's all alien to me.

 

[Dave Rickey]

By Digipower pack you mean something like this right?

Amazon.com: Digipower BP-NP700 Replacement Li-Ion Battery for Konica-Minolta NP-700: Electronics

Not quite, same manufacturer but this is what I was talking about.

--Dave