TF 3000 18650 batteries just arrived.

[jacktheclipper]

Seems like a real world way to do things .

[The_Grand_Pooh-Bah]

I ordered mine on the 10th and no sign of them yet.....

[Streamer]

Dispatched Jan 9 received today Jan 27....18 days woooooohhh

Purrty little jewels....

[viktori]

@BetweenRides

@Chidwack

Well, I just got done with a run time test on the same M3X using 2 Redilast 2900 batteries. The light clicked off at exactly 2 hours. I checked the batteries and one of them had triggered the protection circuit. After I reset it, they both had 3.18 volts. Also, the light didn't seem to get as warm/hot using the Redilast batteries. Here are my unscientific tests so far.

TF-3000. Two tests. One shut down at 1 hour and 50 minutes and the other 1 hour and 45 minutes. Just under 3.50 volts left in the battery.

TF-2400 flames. One hour and 45 minutes. One battery was 3.51 volts and the other 3.66 volts

Redilast 2900. Two hours. Both at 3.18 volts.

I'd love it if somebody could explain all this in terms of capacity, current and internal resistance. Seems like a teachable moment....

This gives you a clue:

@Chidwack

Another thing I noticed when using the new TF 3000s last night, I stepped outside with my TK41 and the M3X. It seemed like there was more of a difference between the brightness and throw between the M3X and the TK41 than there used to be. It was like the M3X was brighter when using the TF3000 batteries. I also noticed that the light seemed to get hotter with the TF 3000 batteries than it did this morning using the TF 2400 flames.

TF3k is able to provide more current than TF2k4. -> Light is brighter and lasts equal amount of time.

Or so it seems to me. I'm too lazy to go find the proper formula for this.

BTW, it's Ohm's law. If someone finds a proper formula for this, please post it.

Viktor

[ezarc]

@viktori

TF3k is able to provide more current than TF2k4. -> Light is brighter and lasts equal amount of time.

Or so it seems to me. I'm too lazy to go find the proper formula for this.

BTW, it's Ohm's law. If someone finds a proper formula for this, please post it.

Viktor

Hard to tell with these kinds of battries as most of them dont have a "c" rating.

mAh x c = max amps

I dont acctually remember what the c stands for (current?), but mAh is like a fuel tank and c is the delivery system, it only lets so much pass through.

If it lets more pass through (higher c rating) it will be faster/brighter/stronger/whatever but not necessarily have a longer run time.

I know I suck at explaining but I had the same thing explained to me this way about RC car batteries.

[viktori]

Q = t × I

Q is capacity at 1 A

C is time in hours

I is current in amperes

So, roughly, or perhaps ideally, how long would a TF 2400mAh last at 1A?

Q = 2400mAh = 2.4Ah
I = 1A
--------------------
t = 2.4h

Of course, in real world things are not so simple, temperature plays a big part, variation in current, and even the formula is (from what I'm reading) slightly different at different current than 1A.

So, take this with a two grains of salt.

But you are correct with tank+pipe analogy. Battery is a tank that has a hole of certain size. It can only give as much liquid as the hole size, no more. Also, if you use a smaller pipe (than is the tank's hole) to deliver the liquid, it will take longer to empty the tank. Amount of liquid is almost constant. Unless you try compressing the air into tank to try to push liquid faster. Then some liquid can spill where your pipe is attached to the hole. If you push too hard, even worse things can happen.

Now, think of too high temperatures, pushing the batteries too far and all kinds of venting and explosions.

Use brain and stay safe. :)

Viktor