Running P7 with 18650.

[rizky_p]

I modified a single 18650 cree light with P7 and only get a 1.6A on Ultrafire Unprotected(blue) and 1.1A(edited 1.2A) on Ultrafire protected(gray) both fully charged ,not a worthy upgrade IMO since its only slightly brighter than Q5. Has anyone try direct driving a P7 with other brand of 18650 and measured them? I would like to know how AW's 18650 performs in this regard.

Thanks.

 

[M.S]

I get ~2.2A with grey protected ultrafire 18650 and ~3.1A with black AW cell when using fresh cells. I only measured one cell of each, so there could be variations between multiple cells.
If it makes any difference my light is HA3 ultrafire C2 with KD c-bin P7.

 

[LEDninja]

Are you running direct drive or through an existing circuit board or tailcap resistor?

I got 2.1A from both Ultrafire protected gray and Trustfire blue in my MTE 5 mode.

 

[rizky_p]

Are you running direct drive or through an existing circuit board or tailcap resistor?

I got 2.1A from both Ultrafire protected gray and Trustfire blue in my MTE 5 mode.

The re-used existing board is just a plain board with a resistor wrapped inside a heatshrink tube. I removed the resistor and run the P7 in DD mode.

Battery draw measured with the tailcap removed using a DMM lead in serial configuration. The voltage probably drop too much under the load, i have to try AW's 18650...

 

[phantom23]

Ultrafire C8, P7 CSWOJ from KD, this 18650 cell (3 years old) and 3,5A to the led.

 

[rizky_p]

ow man, i am the only one with the below 2A result

@phantom23: i am using the same P7 bin.

 

[uluapoundr]

Is it the battery or the host? What is your battery volts and volts at tailcap? Possibly some resistance in the host?

 

[rizky_p]

Is it the battery or the host? What is your battery volts and volts at tailcap? Possibly some resistance in the host?

Both but i think battery play bigger roles in cousing low amp being deliver to LED. Battery voltage measured 4.15v while resting and drop quite significantly under load. I want to order from AW but Marketplace is down :mecry:

this is the host

The reflector and P7

And P7 mounted on thick Star

Thanks

 

[phantom23]

I know it's OT but can you post some beamshot. I have similar flashlight (with P4) and I'm thinking about P7 in it.

 

[rizky_p]

I know it's OT but can you post some beamshot. I have similar flashlight (with P4) and I'm thinking about P7 in it.

Weird thing is i tried running the light with 14500 it draws 1.6A

No problem here you go.

You have to tweak the reflector position and enlarge the opening.
More beamshots
http://www.candlepowerforums.com/vb/showthread.php?t=197982

Thanks.

 

[Northern Lights]

I modified a single 18650 cree light with P7 and only get a 1.6A on Ultrafire Unprotected(blue) and 1.1A(edited 1.2A) on Ultrafire protected(gray) both fully charged ,not a worthy upgrade IMO since its only slightly brighter than Q5. Has anyone try direct driving a P7 with other brand of 18650 and measured them? I would like to know how AW's 18650 performs in this regard.

Thanks.

I have an MTE 5 mode that I jumped resistors to direct drive on a TrustFire 2500. It reads 3.5 amps on a charged battery. It rocks, it beats my R2 module that is on 13.2 Volt N30 spot light, my 3x Q2s, My 3X SCC P4s, and is up there giving competition to my A123 powered 5761!

Try this. If you can get to the LED directly wire, jumper, it to the battery and take the reading. You will find if the LED and battery combo is bad, ok, or if the problem lies in the other parts of the circuit. Eliminate the LED and Battery combo question.

Good luck, it was a great upgrade for me hope it works for you.

 

[rizky_p]

I have an MTE 5 mode that I jumped resistors to direct drive on a TrustFire 2500. It reads 3.5 amps on a charged battery. It rocks, it beats my R2 module that is on 13.2 Volt N30 spot light, my 3x Q2s, My 3X SCC P4s, and is up there giving competition to my A123 powered 5761!

Try this. If you can get to the LED directly wire, jumper, it to the battery and take the reading. You will find if the LED and battery combo is bad, ok, or if the problem lies in the other parts of the circuit. Eliminate the LED and Battery combo question.

Good luck, it was a great upgrade for me hope it works for you.

I did as you said, i remove the pill and directly connect the battery and got the same 1.6A battery draws. Apparently it is the battery since host resistance is basically gone, now i will have to order several Trustfire they seems to be better than Ultrafire. Have anyone tried Trustfire 2000?
never had any flashlights where the battery seems to be so critical as this P7 direct drive :sigh:

Thanks.

 

[LEDninja]

It could be your meter.
I remember in 24V 4-20 mA instrumentation the standard method of measuring the amps is to put a 250 ohm resistor in series then measure the voltage drop across the resistor. The voltage is then converted to mA in the circuitry. Your meter may be working the same way. If the meter is calibrated for 12V or 24V the numbers will be off at 4V. Also the resistor will act as a dropping resistor and reduce the amps to the LED.

I got some more rough #s off my MTE 5 mode
4.1V 2.1A
3.9V 1.8A
3.8V 1.6A
3.7V 1.5A
at which point the light seems to start to get dim so I am charging the battery.

 

[rizky_p]

It could be your meter.
I remember in 24V 4-20 mA instrumentation the standard method of measuring the amps is to put a 250 ohm resistor in series then measure the voltage drop across the resistor. The voltage is then converted to mA in the circuitry. Your meter may be working the same way. If the meter is calibrated for 12V or 24V the numbers will be off at 4V. Also the resistor will act as a dropping resistor and reduce the amps to the LED.

I got some more rough #s off my MTE 5 mode
4.1V 2.1A
3.9V 1.8A
3.8V 1.6A
3.7V 1.5A
at which point the light seems to start to get dim so I am charging the battery.

hmmm, i am using a 10A dial on my DMM and using a different port than the one for lower amp measurement. Is this also using a resistor? I have a Mag P7 and it is running @2.9A using the same method.

 

[LEDninja]

hmmm, i am using a 10A dial on my DMM and using a different port than the one for lower amp measurement. Is this also using a resistor? I have a Mag P7 and it is running @2.9A using the same method.

Looks like your meter is working properly. Either you got a bad LED or there is some resistance you have not identified. It only takes 1 ohm or even 1/2 ohm to reduce the amps significantly with the P7.

HIJACK
BTW are you the guy that posted the battery pictures in DX. The Trustfire unprotected blue looks taller than the Ultrafire protected gray? I have a battery fit problem and am looking for the shortest 18650.
/HIJACK

 

[rizky_p]

Looks like your meter is working properly. Either you got a bad LED or there is some resistance you have not identified. It only takes 1 ohm or even 1/2 ohm to reduce the amps significantly with the P7.

HIJACK
BTW are you the guy that posted the battery pictures in DX. The Trustfire unprotected blue looks taller than the Ultrafire protected gray? I have a battery fit problem and am looking for the shortest 18650.
/HIJACK

I checked the blue Unprotected Ultrafire 18650 drop to 3.2v(4.15 resting) when the light is switched on. Definately the battery. :scowl:

Yeah thats me, could you post the link to it since i can't remember where(PM please) I dont have Trustfure anymore i gave it to my friend btw