Does anyone know what cell the Cyansky BL1834U battery uses internally, or otherwise its detailed specs?

[dmenezes]

@Mandrake50

I looked… the program that I used uses 0.18. So that and 1 amp charge current, 4.2 volts termination voltage.

Thanks for looking! 0.18A seems a little high, tho (I’m used to seeing this at under 0.1A for the other batteries I’ve been using)

Meanwhile I’ve been looking at ‘real’ manufacturer aka OEM cells (of which all others are supposedly rewraps) and it seems that (according to Parametrek ) the closest to the BL1834U is the Sanyo/Panasonic NCR18650GA, Parametrek lists it as 3430mAh while Panasonic’s product page indicates a nominal capacity of 3400mAh (average of 3350mAh minimum and 3450mAh typical).

So I dived a little deeper into the NCR18650GA and posted my findings and further questions here: Sanyo/Panasonic NCR18650GA: recommended MC3000 parameters for charging/discharging in order to reach nominal capacity?, if I fail to obtain more specific information (ideally from CyanSky) I may try and test mine with these parameters.

@Mandrake50

BTW, I get it, but I wonder how many reviewers go to this length to test cell capacity. Or how many slap them in a Vapcell or Xtar unit and just let them run at the defaults. Not that you are somehow wrong in doing it “better”. Just the comparison thing again.

Agreed. In the end it might make very little difference – but we won’t know until we test.

@Mandrake50

But yeah, if just trying to test the capacity claim, I guess the closest you can come to duplicating the Cyanski test conditions is to stay tight with the manufacturers specs… if you can get them.

Exactly! Let’s give them a few days to respond to my PM.

@Mandrake50

BTW, I don’t know if you are setup to test it, but I would be interested in knowing the parasitic drain on the headlamp.

unfortunately my only multimeter (an Uni-T UT210E) isn’t able to measure current with its testing probes (which would make that really easy (to say nothing of precise), only with its clamp so I would have to find a way to get a piece of wire (large enough to make a loop to place the clamp into) to make contact with both the bottom of the battery and the unanodized edge of the flashlight tube… hummrmrmrm… OK, I will try and figure it out.

Meanwhile, have you seen the 1Lumen’s excellent HS5R review? It does list “Parasitic Drain” as 19.1uA, which is quite low.

@Mandrake50

I charged the cell and it was at 4.17 volt resting (30 minutes). I just checked it and it was at 4.07 volts. That was what, after maybe 6 weeks. I think this thing might disappoint if left to sit for 6 months or a year without mechanically locking it out.

Agreed, disappointing and (unless you have a bad cell) indicating a much higher parasitic drain than 19.1uA. I presume this was with the cell that came with your HS5R? Perhaps its not that great of a cell after all

@Mandrake50

Guess what ??? I took a closer look. I didn’t get the same cell that you did. Mine is a BL 1826. A 2600 mAh cell. Notice no “U” in the designation. It has no USB charging port I see their web page lists the 1834U with the light. But that is not what I got… But what do you want for free…???

WTF?! So Cyansky shipped your light with a different (and much inferior) cell than the BL1834U they themselves indicate at their HS5R product page?! This sounds like (at best) a mistake on their part. I would contact them and ask for a replacement, the cell you received is much inferior both in capacity and in function (as it has no USB port), to say nothing of being possibly bad (as per the voltage drop you measured with the flashlight shelved). Alas, my HS5R kit came with a missing USB charging cable – not as bad as the battery swap they made with yours, but it seems to indicate their packaging/shipping departments do have problems.