"Unprotecting" protected batteries....

[Jmillerdoc]

anyone ever tried this? I understand there is a small circuit under the pos cap of the protected battery. Anyone ever tried to drill one through and connect it directly to the cap bypassing the circuit. Why...well, I understand they limit the current output max....not always a desirable feature. Just wondering if I could do this if I might be able to put to good use some cheap Ultrafire batteries in my Green lasers that require a high discharge rate battery to get top performance.

 

[Cyparagon]

Let's start at the beginning. Do you have reason to believe protected cells are performing more poorly than non-protected cells? Have you measured anything?

 

[rocket689]

anyone ever tried this? I understand there is a small circuit under the pos cap of the protected battery. Anyone ever tried to drill one through and connect it directly to the cap bypassing the circuit. Why...well, I understand they limit the current output max....not always a desirable feature. Just wondering if I could do this if I might be able to put to good use some cheap Ultrafire batteries in my Green lasers that require a high discharge rate battery to get top performance.

LaZerz did a tutorial on removing the PCB.
http://laserpointerforums.com/f51/removing-pcb-cells-65011.html

 

[HaloBlu]

Please, please don't bring a drill near a Li-ion. :umbrella:
Just use Li-Mn for high loads. They can handle it plus they are much safer for high loads & in general.
Despite the difference in labeled capacities at high loads it seems to be about the same for Li-Mn & Li-ion. :san:

 

[BShanahan14rulz]

anyone ever tried this?

Yes, people have removed the protection circuit from the battery, thus removing a very useful safety feature.

I understand there is a small circuit under the pos cap of the protected battery.

No, that is the PTC material, another safety feature of these cells.

Anyone ever tried to drill one through and connect it directly to the cap bypassing the circuit.

No, because if you did that, you'd get a face full of fire.

Why...well, I understand they limit the current output max....not always a desirable feature.

Why? Do you WANT your cells to explode from pulling too much current from them?

Just wondering if I could do this if I might be able to put to good use some cheap Ultrafire batteries in my Green lasers that require a high discharge rate battery to get top performance.

You might be able to. You also might be able to burn that green laser and your house with it too. Ultrafire cells are already a gamble, why increase the risk by removing the protection circuit? Just buy one or two good cells for your better lasers. If your ultrafires can't power your laser, chances are it is because of dreadful voltage sag when the cell is loaded. That is an indication of a very old cell, or an 'abused' cell.

AW, Callie's customs, redilast, these sellers are known for taking new, name-brand cells and rewrapping them along with a protection circuit and, in some cases, a positive cap that allows them to be used in lights that might not make a connection there otherwise.

 

[Benm]

I think they only good reason to remove the protection circuit from a battery is when it is defective. Usually the protection circuit is on the cathode (negative) end of the cell, and easily removed after taking away the insulating material around the cell.

If you are considering removing the protection circuitry to get more current out of a cell, i'd advise against it, since the circuitry is usually configured to keep that particular cell within safe operating limits.

Exceeding those limits is by no means a guarantee the cell will eplode on you, but getting cells with specifications that match the job would be greatly preferred. Lithium batteries failing badly are rarely worth the risk since the consequences can be quite dramtic resulting in real fire hazars, not just broken cells.

 

[BShanahan14rulz]

sometimes a cell seems defective because it is reading almost 0V. This is often caused by the protection circuit being tripped and needing to be reset. Dumb chargers will usually reset it.

 

[tsteele93]

My problem is none of the lasers I own that take the 10440 can handle the LENGTH of the protected cell.

 

[LarryDFW]

anyone ever tried this? I understand there is a small circuit under the pos cap of the protected battery. Anyone ever tried to drill one through and connect it directly to the cap bypassing the circuit. Why...well, I understand they limit the current output max....not always a desirable feature. Just wondering if I could do this if I might be able to put to good use some cheap Ultrafire batteries in my Green lasers that require a high discharge rate battery to get top performance.

While I am not a fan of protection circuits . . .

I think trying a quality #18650 cell will give you the discharge current needed to operate your green laser.

High capacity #18650 cells can deliver ~ double their rated capacity or 5-6 amps.

LarryDFW

 

[Brenner]

I understand that many people would like to use their "cheap" batteries in different ways.
But, most of these batteries will not handle high current - only one of the reasons they are cheap. Using those same batteries without protection will lead to pretty dangerous situation, and fire extinguisher is highly recommended to have close and ready for action.

If you really want to play with higher currents, then invest a few bucks more, and get yourself something real: like Panasonic CGR18650CH which will be happy cell at 10A continuous discharge rate.

Don't play with fire , I mean UltraFIRE


:beer:

 

[Fiddy]

Protection circuits.....annoying...if you put a big load on them, they open circuit the battery and stops your laser from lasing, Just another thing to go wrong i say.

If you check your cell voltage's regularly then you can have the best of both worlds.

 

[electron]

My problem is none of the lasers I own that take the 10440 can handle the LENGTH of the protected cell.

I see some battery dealers recommending he use a quality 18650.......Problem is his Laser uses a 10440 as he stated above, I don't think he'd be happy with that "solution". Sorry guys I know you want to sell batteries, but he needs an 10440, and because of length it's needs to be un-protected.......you guys have them?

 

[Brenner]

I see some battery dealers recommending he use a quality 18650.......Problem is his Laser uses a 10440 as he stated above, I don't think he'd be happy with that "solution". Sorry guys I know you want to sell batteries, but he needs an 10440, and because of length it's needs to be un-protected.......you guys have them?

No , you are wrong- I know that scrolling is hard to do, but read the first post - here it is :
anyone ever tried this? I understand there is a small circuit under the pos cap of the protected battery. Anyone ever tried to drill one through and connect it directly to the cap bypassing the circuit. Why...well, I understand they limit the current output max....not always a desirable feature. Just wondering if I could do this if I might be able to put to good use some cheap Ultrafire batteries in my Green lasers that require a high discharge rate battery to get top performance.

High discharge rate = Panasonic CGR18650CH ( I do not even have it in stock)

We are not always here to sell , but to help folks better understanding how some things (in this case batteries) work.

Thank you

 

[Lase]

I see some battery dealers recommending he use a quality 18650.......Problem is his Laser uses a 10440 as he stated above, I don't think he'd be happy with that "solution". Sorry guys I know you want to sell batteries, but he needs an 10440, and because of length it's needs to be un-protected.......you guys have them?

That's not the OP that was talking about 10440 batteries.

No specific batteries other than 'High Discharge' were mentioned.

Jmillerdoc - What kind of batteries are you looking for?

Lase

Post 405

 

[electron]

Ahhh I see two different persons posted a problem in this thread.

 

[tsteele93]

Ahhh I see two different persons posted a problem in this thread.

Just so you know that I wasn't trying to hijack the thread, I was merely posting ANOTHER reason someone might want unprotected cells.

There seemed to be a pretty severe backlash against unprotected cells. I was pointing out that I didn't really have a choice.

I have the proper cells, so no problem here. I think I went to lighthound. I will check some of the folks here on the forum next time though!