SSR-90 with an AW 2600ma 18650 in direct drive?

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Greg G

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I'm building another *fun* small light. The host is a Surefire C2, and I'm installing an SSR-90 and using an 18650 in direct drive to power that. Z41 switch set up for momentary use only.

Lighthound is out of stock on the IMR 18650's, so I was wondering *if* it would be ok to use a 2600ma AW cell I have on hand in the beginning?

Will it harm the battery? Will too much current be drawn from it?

Thanks!
 
I'm no "expert" but I'd say if you run it direct drive, there is a good chance you'd trip the protection circuit built into the battery if the load spikes to over ~5A.
 
the protection circuit keeps an eye out for volts not amps.
the AW 2600 is ok at 2C discharge.
 
calebra said:
the protection circuit keeps an eye out for volts not amps.
the AW 2600 is ok at 2C discharge.
Click to expand...

The overdischarge and overcharge parts of the circuit watches the volts. However, they also have protection against overcurrent (i.e. short circuit).

AW rates the 2600 at 5.2A max. Assuming that AW has set the over-amps to that level (maybe someone can confirm this), if that is exceeded, it will just cut itself off.

However, I'll let others chip in on how likely it is you'll get up to that level. I for one, think that there's a good chance you'll just trip the protection circuit. Given that the AW2600 holds > 3.6V at 5A, but that the SST90 at 3.6V wants to pull ~7A.
 
It should be fine. I've run the sst-50 w/ a AW protected 17670 and the sst-90 on two parallel AW protected 18650 on direct drive w/ no issues. In fact the bigger issue was running them on IMRs and putting the LEDs at risk for overcurrent. I burned out a sst-90 on two parallel IMR 18650s (FM Mag Dual Bore) and the sst-50 gets super hot on any IMR (18650 or 26650) at direct drive (sst-50/P60 host/single level. Runs fine w/ 3-level PWM direct drive).
 
Last edited:
hoongern said:
The overdischarge and overcharge parts of the circuit watches the volts. However, they also have protection against overcurrent (i.e. short circuit).

AW rates the 2600 at 5.2A max. Assuming that AW has set the over-amps to that level (maybe someone can confirm this), if that is exceeded, it will just cut itself off.

However, I'll let others chip in on how likely it is you'll get up to that level. I for one, think that there's a good chance you'll just trip the protection circuit. Given that the AW2600 holds > 3.6V at 5A, but that the SST90 at 3.6V wants to pull ~7A.
Click to expand...
i have 8 of AW's new 18650's and on none of them this is the case, overdraw and eventually u will kill the battery.
in fact i have yet to see any protection circuit on any battery work 100% a 100% of the time.
 
calebra said:
i have 8 of AW's new 18650's and on none of them this is the case, overdraw and eventually u will kill the battery.
in fact i have yet to see any protection circuit on any battery work 100% a 100% of the time.
Click to expand...

That's interesting. How much current have you been pulling from the 18650s? I know that with some cells, incan hotwire people have been tripping their cell protection when the bulbs pull too much current from the cells - and end up having to double/triple click their lights on and off before it comes on - and this only happens with protected cells.

AW also lists protection against short circuit. I'm sure that means over-discharge protection...? If you look at Silverfox's tests, you'll see that some cells terminated because the discharge currents were too high.

Anyway, I can't comment because I don't own any protected 18650s.. I mainly use IMRs these days. So take my comments with a grain of salt. I'd be interested to know how much you've been pulling from your cells.

Theoretically, driving a SST90 at 10 amps on 2 parallel 18650s should be fine since they'd both be only doing 5 amps each.

And I'm just going to take a guess with the 17670 - Under 4amps, Vf for the SST50 is ~ 3.8V, which is what the 17670 would sag to (Silverfox shows the 17500 sagging to 3.6V under 4A, so assuming the 17670 sags less, you may get ~ 4A)

Of course all this is dependent on your cells and LED and resistance... and I'm just playing a guessing game.
 
calebra said:
i have 8 of AW's new 18650's and on none of them this is the case, overdraw and eventually u will kill the battery.
in fact i have yet to see any protection circuit on any battery work 100% a 100% of the time.
Click to expand...

No protection circuit will work 100% of the time. I think the low voltage protection will only work if your drawing ~500mA or more.
 
I'll wait until I get some IMR's to light it up. I paid too much for these 2600's to risk killing one.

Thanks guys!
 
will be interesting to hear how it goes with a single IMR 1.6.

My sst-90 is drawing 13.5 amps off 4 D nimh's
 
Last edited:
I am having issues in a D host with single AW IMR 18650. Please be careful using this battery with a direct drive setup. I may provide more details later.
 
Coast, Lighthound had a couple stashed away that they sold to me. Got them Tuesday. I love that place.

Flashfiend.....what issues are you having?

Thanks,

Greg
 
Thanks, and PM replied to.

In light of your problems, and my own lately, I think I will mock this build up on the table with a resistor to get an idea of what is going on, before I proceed to direct drive on an IMR battery.

I'll report back here.
 
Greg G said:
I'm building another *fun* small light. The host is a Surefire C2, and I'm installing an SSR-90 and using an 18650 in direct drive to power that. Z41 switch set up for momentary use only.

Lighthound is out of stock on the IMR 18650's, so I was wondering *if* it would be ok to use a 2600ma AW cell I have on hand in the beginning?

Will it harm the battery? Will too much current be drawn from it?

Thanks!
Click to expand...

Lighthound has them back in stock, just ordered three.
 
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