2x modded flashlights.
TK 75 and TK 61 bumped to around 4.5A with mod.
Sadly i’m far from expert, and have no clue how does that driver works, how much it pull from the cells and so on. Maybe i will just waste money? 
If the drain is 4.5A per cell (and not some driver magic) it will be a good purchase.
Maybe someone with those flashlights can chime in, i don’t know if they have low voltage protection built in so wouldn’t require protected cells?
The flashlight turns on high after the voltage drops below ~ 3.7/3.6V, and it has low voltage warning AFAIK.
If the light has low voltage protection or warning i would just get unprotected IMR’s for it.
The IMR have even less voltage sag compared to PF?
IIRC (if I remember correctly) from your posts you only use protected cells.
PD/PF’s with protection circuits……are very rare, like hens teeth….
I personally do not go with the hysteria surrounding the safety of these cells and the absolute need for protection circuits as a lot of people contend. High drain cells and especially ultra high drain cells and protection circuits are IMV (in my view) are not that good together, so I would not consider buying any with that feature. Mind you I am only talking about high quality cells.
You might be thinking of me from this thread.
Some good info here, I am also looking around at options for Vinh’s new S200C2vn
Hi guys. Thanks all for the help!
I found this cells, i guess they are the best option? they even beat handly the Panas PF….wow. Are they safe? anything you can tell me about this IMR Keepower? do they last around the same period? build quality? thanks.
http://lygte-info.dk/review/batteries2012/Common18650comparator.php
I just realized that the two modded lights you mentioned use a 2S2P 18650 configuration, so no single cell is going to be putting out anywhere near 4.5A. This renders your search for IMR cells, for this application, essentially fruitless, because you’ll be giving up runtime for no increase in brightness. In fact I’d argue that this would be the case even if you did have an application that required 4.5A per cell, since the heat generated by significantly overdriving an LED can actually decrease brightness very quickly, and the only real way around that is to solder the LED to a solid copper block or something.
TL;DR: stick with standard cells for the extra runtime.
So you are telling me to just use my 18650B green protected? i have problem with them, they can output only ~ 40 mins on turbo, after which the TK 75 2900 lm version is going into high mode from turbo, if you use it more then 1/2 mins. I think they are damaged? since other user on this forum is getting around 60 mins but he has 2600 lumen version. Anyway the new TK 75 is using XML2 which are like 10% more efficient so it should be the same, but not sure. So in short i lose like ~ 40% runtime compared to him.
How much amps will be drained as max from my cells at turbo with modded lights? ~ 4.5/4.7A? sorry noob about electronics.
I just purchased 6 of these:
http://www.aliexpress.com/store/product/2PCS-10A-KeepPower-imr-rechargeable-3-7V-2900mAh-18650-high-power-battery-Free-shipping/1216163_1852915358.html
They are re wrapped PF’s with a button top.
1 for my S200C2vn and 4 for the MM15vn.
Hi, thanks for the links.
Are those better then” this?
They are the same but with a better button top.
A stock TK75 2900 lumen version works great with 4 NCRB’s. Long run times.
I think from memory it throttles back after 20 minutes, but you can just go back to turbo again if you want.
Yes i tired that, but after 40 mins i can no longer use turbo, others can, i did it with restarts, and i get like 40 mins only with 1.5 years old cells and at max 50 recharge cycles.
What do you men by better button top? thanks.
BTW for other users which are confused by the title, and the way this thread went in opposite direction.
I decided to try unprotected cells, because i just read they only vent, and no explosions or something for PF/PD series, so i’m more then ok with that knowing how much better the voltage is on the PF/PD vs protected 18650B.
For a light that pulls ~4.5A from a 2S2P configuration (that’s two pairs of two cells in series), it’s only ~2.25A for each individual cell.
What I was pointing out is that there is essentially little (or no) benefit to be gained from using IMR cells over the unprotected NCR18650B cells (or protected NCR18650B cells that use a very low resistance protection circuit) in the scenario we are discussing.
I seriously doubt that an NCR18650A/B cell would ever do anything more than vent either. Unless you stabbed it with a knife or something. They are already very safe compared to cheaper cells because of the superior design and manufacturing principles that Panasonic employ.
Thanks. The reason why i wanted the PF is a more flexibility if i ever use some ultra high power flashlights, and some user at CPF told me that its 4.5A per cell with vinhd mods.
I want to get like one for all type of cells instead of buying protected now and being unable to use them in future if i go crazy with mods.
My 18650B are acting weird, that’s why i wanted to get the PF’s.
If this is the one you bought: http://www.cpfmarketplace.com/mp/showthread.php?299492-ALL-SOLD-vinhnguyen54-TK75vn-Sale-Thread-Batch-1-220
it’s definitely less than 3A per cell.
Fair enough. Your reasons are your reasons. I’m just trying to add some perspective here as I think that IMR cells have an inflated reputation for our purposes these days, and the proof is in the testing and in the examination of what LED brightness is ultimately a function of.
I wont buy his lights, my friend is going to mod them to around 4.5A + from factory 3.1A i think. But i’m not sure about how much its from cell, i was told that is 4.5A per cell, and i think my friend mod will be done the same way or similar to vinhn.
No problem, you did great and helped me 