MN16 on 2x Keeppower 16650 cells (2500 mAh)?

I have three MN16 incoming, that I can use in my KT-1.

Awhile back, I compiled a reference cut-and-paste Word document listing everything I could find regarding the "SF turbohead tower lamps" and other SF and LF incan assemblies here on CPF.

My notes indicate that 2x18650 will overdrive the MN16, but no mention of 2x17670 doing the same thing.

Where does the 16650 fit into all this?

And since I am such a "last-in-class" regarding electronics, what is it about the 18650 that is doing the "overdriving" in this situation?

Thank you!

novice said:

I have three MN16 incoming, that I can use in my KT-1.

My notes indicate that 2x18650 will overdrive the MN16, but no mention of 2x17670 doing the same thing.

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MN16 is a 6.6 volt, 2.5 Amps bulb and will be overdriven with two Li-ions of 18650, 17650, and 16650
The only reason this combination works is that batteries have some voltage drop during operation that saves the bulb.
IMR bulbs have less voltage drop under same current and are more risky.
All these are for fully recharged cells and less to worry about partially charged cells.
Another word, concern is when batteries are healthy and fully recharged and not much different on initial voltage under load of 18650 or 16650
When remaining capacity of each cell is 50% or 60% the risk is almost eliminated no matter 18650 or 16650
I highly recommend soft start if you can find one.

The MN16 being a HOLA is a bit touchy. I probably wouldn't try this with IMR cells or 18650's. I would expect a *poof*

Thank you both very much.

I also have a MN16, but I run it on LiPo 18500x2 (1000mah). Is this safe for these batteries? Can they handle the power draw of the bulb? I don't run it for extended periods, maybe 5-10 minutes. But I feel that the power draw of the lamp and low capacity would not give me much more than the current times I use it now. I'm just wondering. The lamp is bright, not super white, but bright enough, enough to not risk blowing it up on freshly charged 18650s/16650s.

I also run my MN11 and P91 on 18500 Lipos. Am I good to continue this practice?

I've run an MN15, and M91 om two times 18650 with no problems. I would use my Soft start (AW) on anythin with higher amps.

Bill

rrego said:

I also have a MN16, but I run it on LiPo 18500x2 (1000mah). Is this safe for these batteries? Can they handle the power draw of the bulb?


I also run my MN11 and P91 on 18500 Lipos. Am I good to continue this practice?

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P91, MN11 and MN16 run very easily (not overdriven) on pair of 3.2 volts LiFePO4 batteries and 2.5 Amp draw is OK for LiFePO4 cells. If run time is enough for you then your setups are fine.
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Bullzeyebill said:

I've run an MN15, and M91 om two times 18650 with no problems. I would use my Soft start (AW) on anythin with higher amps.

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MN15 is 7.5 volt bulb but P91 is 6.6 volts.
So running a 6.6 volt bulb with 7.4 volt is pretty high overdriving but for 7.5 volts MN15 is relaxing.
You can drive say 7.4 volt, 3 Amps bulb with pair of 18650 without overdriving and not worry about flashing bulb.
Also can drive say 6 volt, 1.7 Amps bulb with pair of 18650 with severely overdriving and close to instaflash point.
As you see percentage of overdriving is more imporatant than current draw.
Soft start is always good for any bulb with any current draw and setup.

fivemega, you did not mention the P91. Am I good to run the P91 on the 18500 LiPos also?

Thanks for clarifying/confirming that MN11/MN16 are good on those batteries.

rrego said:

fivemega, you did not mention the P91. Am I good to run the P91 on the 18500 LiPos also?

Thanks for clarifying/confirming that MN11/MN16 are good on those batteries.

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If your batteries terminates (fully recharged) at 4.2 volt, then this is too risky for P91, MN11 and MN16
Mentioned bulbs are OK with two LiFePO4 batteries.

I misstated, in my earlier post. I meant P90 instead of P91.

Bill

Awesome. Thanks fivemega for confirming P91 also :thumbsup:

Where would one find for purchase this "soft starting" switch ?

BigBaller said:

Where would one find for purchase this "soft starting" switch ?

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BigBaller, these have been sold out for quite some time, so tracking one down might prove to be a bit of a quest.

Below is the original sales thread. There was also a version made for m@glites.

https://www.candlepowerforums.com/v...an-Driver-Switch-For-SF-P-C-M-series-Tail-Cap

That's such a smart idea tail switch for high amp setups. I guess no other company ever made them or would go to the trouble of making one now that the incandescent days are mostly long gone? Good info in this thread, with the other battery chemistries etc.. I have an A19 coming in the mail so I can finally use my extra 16650s in 9p and m3T forms ..I really like the higher hotspot of the mn16 vs mn15 , and p91 vs p90, but I don't want to stress the bulb . Maybe I'll drain the 16650s partly as aforementioned, with a p90 then see what kind of remaining runtime I'll get out of the mn16.:thinking: