TrustFire TR-J12 5*CREE XML T6 from DX MF and KD

Those looks like 26650 King Kongs (not 18650). Please let me know if you ever can use them on TR-J12. Thanks. They should not work.

I couldn't resist it, I ordered one from DX in spite their unbelivable long delivery times :)

These are the ones I'm going to try

They are too short. You need longer (protected) ones.

I would avoid protected, can't you use spacer or longer springs?

Let's hope so.

Too short is easily fixed, too long isn't. :)

it has to work, no one reported that problem

Are you gessing that they are or are you sure? I haven't actually tried them yet, they're still charging. But why so negative :P? If three 18650 fits then three 26650 should, they even fit each others chargers...

Bah...just put some solder blobs on them.

Do not try neodymium disc type magnets. They might short out at the positive end, should you knock the light hard while it is switched on. It's not supposed to, coz the internal is anodized. But there might be negative contacts at the front and you know Murphy's law always kicks in. 3 x 26650 gives a lot of boom, these are not IMRs. Be careful when using them HB201 and jurdiciously monitor the voltages. Do not use for long periods or leave it unattended.

These are not imr's you mean those king kongs are weaker? Their capacity and resistance are ok...

I believe he is going by the manual, which is probably not properly translated. Theoretically, the voltages of 3 x 18650 will be the same as 3 x 26650.

Doh! Negative? Just facts. I know. J12 works with 3x26650 and 3x18650. You just have to find tricks for your King Kong 26650. :)

Huh. I have had this flashlight about one week.

Try and share some more information with us then. you post cryptic messages and make us try to decipher what you are going on about.

Too short lol.

Maybe just flat end?

It's difficult to share. You guys know everything and I am new to flashlights. I am trying to share info. But it is hard!

I leave this case to experts.

Check out mitro's battery tests, upper left hand search field, it's pretty good. Each king kong can do 10A. So basically each cell can supply 30 watts of power. 3 of them have a 90W potential. Even 2 x King Kongs is a piece of cake for the light.

IMRs are inherently safer. Google LiMn (IMRs) and Lithium Cobalt. BTW, i mentioned safer, not safe. :) The safest is LiFePO4, but that is 3.2V and pretty much lower in capacity. Do a youtube search on everything, you can whack LiFePO4 around like crazy, burn it with a 1300C blow torch, and it'd be quite a while before it explodes. :) Correction, it does not even explode.

Safest is just get 3 x 18650 protected high-quality cells like XTAR 2600/3100 or if you can afford it AW/Redilast and be done with it. Still loads of runtime.

I believe that he's referring to the safer chemistry of the IMR cells. Magnets shift, a short occurs, and you have a pipe-bomb with at least 1/3 more energy than the one that destroyed a coffee maker, window, and human hand.

EDIT: 2100 beat me to the punch by a few sec.