P91 on AW 17500 Protected cells?

[jtivat]

Is it safe to run the P91 on these cells?

Thanks
JT

 

[ninemm]

Hmm. Well I will tenatively say yes w/reservations based on some other threads I have read. Running a P91 on 2 li-ions will decrease the bulb life and maybe run the risk of a

But someone else with more experience should be able to chime in with a definitive answer.

 

[fivemega]

Is it safe to run the P91 on these cells?

Thanks
JT

Current draw of P91 is higher than 2C of 17500 and NOT RECOMMENDED.

 

[DUQ]

P90 = Yes

P91 = No!

 

[ninemm]

Current draw of P91 is higher than 2C of 17500 and NOT RECOMMENDED.

P90 = Yes

P91 = No!

Those were the definitive answers I was sure would come up. Thanks for chiming in guys.

 

[matt_o]

I have gray UltraFires that are rated at 1300mAh. I just checked and my P91 pulls 2.5 amps with them. This puts it just under 2C. The AW's are rated at 1100mAh which puts them over 2C. Are my UltraFires okay to use?

 

[Kestrel]

I have gray UltraFires that are rated at 1300mAh. I just checked and my P91 pulls 2.5 amps with them. This puts it just under 2C. The AW's are rated at 1100mAh which puts them over 2C. Are my UltraFires okay to use?

How about if I mark out the '1100 mAh' on my AW 17500's and write in '1400 mAh' instead?

 

[nzgunnie]

I have gray UltraFires that are rated at 1300mAh. I just checked and my P91 pulls 2.5 amps with them. This puts it just under 2C. The AW's are rated at 1100mAh which puts them over 2C. Are my UltraFires okay to use?

The label on your batteries says 1300 mAh - are they actually 1300 mAh? Unlikely, especially under load.

 

[Brigadier]

I wouldn't risk it. And I wish AW would make IMR17500's. :thumbsup:

 

[fivemega]

I wouldn't risk it. And I wish AW would make IMR17500's. :thumbsup:

P91 is severely overdriven with 2 Li-Cobalt cells.
Even if we see IMR 17500 in future, chance of instaflashling will be greather and poof of $30 bulb is painfull and not reliable.
I highly recommend WA1111 in Sunlight power up with 2 protected 18650 or 2 protected 18500 with 1794

 

[Brigadier]

P91 is severely overdriven with 2 Li-Cobalt cells.
Even if we see IMR 17500 in future, chance of instaflashling will be greather and poof of $30 bulb is painfull and not reliable.
I highly recommend WA1111 in Sunlight power up with 2 protected 18650 or 2 protected 18500 with 1794

So, in a stock 9P/G3, if you want to run the P91, it is primaries only?

 

[jtivat]

So are we talking a danger of wrecking the batteries or the batteries going boom?

 

[fivemega]

So, in a stock 9P/G3, if you want to run the P91, it is primaries only?

Many people overload their Li-Cobalt batteries to over 2.5C at their own risk. It's not safe and I won't recommend it.
However, It's your choice.
If you really want to use P91 in 9P size, at least have it bored out and use pair of protected 18500
---------------------

So are we talking a danger of wrecking the batteries or the batteries going boom?

Both.

 

[nfetterly]

I run P91 on 2 IMR16340s - but I also use a AW 3 level soft start. VERY NICE.

I also suggest posting a WTB on P91s - I picked them up for as little as 2 for $15 and as much as 1 for $15.

I also do very very highly recommend the FM/Carley 1794 that Nite is selling for use in FMs holder. I've got ~15 of these bulbs. Incredible.

 

[nfetterly]

Sorry, double post...

 

[jtivat]

What about these?
AW 17670/1600 Lithium Cobalt (LiIon)

They claim they are good to 5 amps.

Thanks
JT

 

[fivemega]

What about these?
AW 17670/1600 Lithium Cobalt (LiIon)

They claim they are good to 5 amps.

Thanks
JT

9P with a cell extender and pair of protected 17670 will overdrive P91 but safe for batteries.
5 Amps claim is for LEDs which do not have initial spike.
Pair of AW's new protected 17670 cells won't power up a ROP 3854 Hi bulb (single click) which needs about 4.4 Amps but initial spike is way higher than 5 amps.

 

[325addict]

I measured capacity of the gray UltraFire 17500 cells: it is around 1075mAh (which is not bad, an AW hardly has more capacity).
The difference is the quality of the cell. While the AW cells retain their voltage very well, the UF cells will go down to as low as 4.04V within 24 hours, while the AW cells will still retain around 4.17V after that time.

If you want a BRIGHT and safe-to-use incan of this size, you just NEED that G4 Sunlight D26 module Fivemega sells!! Indeed, put in a WA1111 or WA1274 (2-cell application) or a WA1166 or WA1185 (three cell application) and you're DONE

I use AW 16340 IMR cells for this purpose. Short run times, but oh so much FUN :thumbsup:


Timmo.

 

[ampdude]

You could try a pair of AW's IMR14500 cells with some 14mm pvc pipe to keep it from rattling in your three cell light. I sure wish IMR17500's were available for us three cell Surefire users. And some IMR17670's for the two cell Surefire users.

 

[ampdude]

I measured capacity of the gray UltraFire 17500 cells: it is around 1075mAh (which is not bad, an AW hardly has more capacity).
The difference is the quality of the cell. While the AW cells retain their voltage very well, the UF cells will go down to as low as 4.04V within 24 hours, while the AW cells will still retain around 4.17V after that time.

I never had that happen with the Ultrafire Gray cells, but I did get a bad cell in the first batch and I've never had a bad AW cell. Sounds like the UF cells you are referring to are bad cells. I had a Pila cell that would lose its voltage below 4V after about a week or so. That's not normal behavior for lithium ion. Either bad cell or bad protection circuit I imagine.