Battery Station 17670 for Surefire 6p?
- Thread starter Nick2cd
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Those drop ins usually use a buck circuit with pretty high resistance in the path between the cell and the LED. It will likely run dimmer BUT will give you very long runtime in direct drive, diminishing output mode. I have one of those R2 drop-ins and they require about 6.5V to run in regulation.
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Flashfirstask?later
Enlightened
The http://www.dealextreme.com/details.dx/sku.11074 http://www.light-reviews.com/dx_sku_11074/ may be a more suitable drop-in for a single cell configuration compared to the DX 11836.
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mdocod
Flashaholic
Most of us use AW brand protected 17670 cells for that type of application. I don't know much about the batterystation 17670, but their protected RCR123s are good.
Ideally, try to find a module that is designed around the voltage range of a single li-ion cell, they are typically listed as something like "2.7-4.2V" compatible and will likely have more stable regulation. The module that Flashfirstask?later linked to is a more suitable option.
Ideally, try to find a module that is designed around the voltage range of a single li-ion cell, they are typically listed as something like "2.7-4.2V" compatible and will likely have more stable regulation. The module that Flashfirstask?later linked to is a more suitable option.
I have a question for you. I'm currently using a Surefire 6p with a malkoff M60 drop-in and two AW protected RCR123s.
would there be any advantage to switching to the AW protected 17670?
would there be any advantage to switching to the AW protected 17670?
mdocod
Flashaholic
The MalkOff M60 is a buck-regulated module and requires an input voltage slightly above that of the Vf of the LED at the drive level of the module to stay in regulation. The MalkOff modules will run on a single li-ion cell, but they will drop out of regulation part-way through the discharge.
The M60 is best driven on 2xCR123, or 2xRCR123, or in a larger body with say, 2x17500/18500/18500/18650 (depending on body available).
My understanding is that MalkOff also makes a module called the "M30" that has a boost/buck style regulation built in that will run on a single li-ion cell (like a 17670) and stay in regulation. it's a special order item only at this time from my understanding...
IMO: just stick with what you have there.
The M60 is best driven on 2xCR123, or 2xRCR123, or in a larger body with say, 2x17500/18500/18500/18650 (depending on body available).
My understanding is that MalkOff also makes a module called the "M30" that has a boost/buck style regulation built in that will run on a single li-ion cell (like a 17670) and stay in regulation. it's a special order item only at this time from my understanding...
IMO: just stick with what you have there.
Thank you for the info.
Not to sound to stupid but can you explain to me what you mean by "drop out of regulation" and what happens if a LED does that.
Not to sound to stupid but can you explain to me what you mean by "drop out of regulation" and what happens if a LED does that.
DaFABRICATA
Flashlight Enthusiast
The drop-ins use a driver board that regulates the current going to the LED. Thats why you have X-amount of lumens maintained for a specified amount of time before it "drops out of regulation". After that the LED will slowly get dimmer.
kurni
Enlightened
Just a quick note about Dereelight buck-boost. It has an over-discharge feature; I'm not sure if it's normal but mine "flickers" when the battery is low. It doesn't really "flicker" because the brightness doesn't change regularly and rapidly. I'm having trouble finding an accurate word for it; it's more like having a dirty contact but I'm sure it's not dirty because it only happens when the battery is low. Besides, I've used Deoxit & Progold on any contact that I can find.
RGB_LED
Enlightened
wvguy, just wanted to add my two cents... I currently have a SF 6PD w/ M60 drop-in and I use an AW 17670. I've had the light on for 30-45 minutes constant intervals (night-time, mountain-biking) without any noticable dimming and, to my eyes, the output appears to be about the same as using 2xRCR123's - I can't tell but there *might be* more output with the 2RCR's due to the higher voltage.
The advantages that I see over the RCR123's is: only having to charge one battery and there should be a substantially long period where the M60 will still give off light but at diminishing output. Granted, the 2RCR123 setup will give more regulated output due to the voltage being above 4.2v but I think the 17670 has more overall runtime. Actually, I just found this thread that I had bookmarked on Malkoff runtimes: thread re: M60 / M30 runtimes...
I will be doing a runtime test either tonight or by the end of the week so I'll post my results but it looks pretty good based gsnorm's test results in the above thread:
[Quote: gsnorm]:
- AW 750 mah RCR123's in the Surefire C2 + M60: 38 minutes before shutting off.
- AW 1600 mah 17670 + SF C2 + M60: 3 hours before I shut it off - it was very dim at that point. At the one hour mark I pulled the cell and measured the voltage - 3.78 volts. Roughly 1 hour of regulated output and 2 hours of declining output.
[Update]:
Did a very unscientific runtime test using 2x 750mAh RCR123's and 1x 1600mah 17670 last night;
- 2x AW RCR123's: 39 minutes and it shut down. Waited several minutes, tried again and got another 5 minutes out of it before it shut down again. NOTE: these cells are the 2 year-old, blue label cells so newer cells may give more runtime.
- 1x 17670: 2.25 hours and going strong until I had to shut it off to go to bed. Voltage when I shut it down was 3.68 volts which surprised me as I thought it should have been lower. I've recharged the cell so I'll retry this test tonight and see what happens.
[Update]:
- Second run w/ 17670: 3.5hours and still running before I concluded the test. As gsnorm indicated in a previous thread, the output diminished somewhat... but it was a gradual decline and, when compared to output from a Dereelight CL1H w/ 3SD pill, the M60 still had more flood but the hotspot on the CL1H was noticably brighter. Still very usable light level after 3.5 hours.:thumbsup:
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