Twelve NEW 2400mAh 18650s, under $30?

I’ve been meaning to get some anyway, but it’ll take at least 1.5-2 weeks to get here. Would tape be safe temporarily?

Also, for that heatshrink, is a hairdryer ok? I don’t have a heatgun.

Finally, when I order the heatshrink from FT, I’ll also get some of that kapton tape.

Thanks,
Jim

P.S. Do you think those nicks were already there on the batteries before extracting them?

Yes, the nicks were from when the tabs were spot welded, some of mine were on the inside of the group-of-four, no way it could have been done otherwise.

I don't know if a hairdryer is hot enough. I use a butane soldering iron with no tip screwed into the hole in the end, so it just blows hot air out the end. Endlessly useful thing to have on hand. (http://www.google.com/search?&q=ST250K)

I would tape up the damaged ones... and store them away somewhere safe until you get the heatshrink.

Hi,

FYI, the reviews on that heatshrink on FT says hairdryer works ok, but I understand.

Jim

Yeah, it doesn't take a lot of heat, it's easy to overdo it with the torch and pop a hole in it. With the torch cranked down low it's great, quick enough that the cell never feels warm.

Funny thing about heat, whether it's soldering, or heat guns, or welding... sometimes a higher temp keeps the workpiece cooler, because you spend less time pumping heat into it. I've ruined way more stuff from using not enough heat than from too much.

comfy,

BTW, I’m planning to try the discharge on one of the 12 tonight (one of the clean ones). Will post back. I want to try that setting to see if it doesn’t stop midway, anyway.

Jim

I've done a top-up/discharge/charge/discharge on a few of them so far (before I got distracted by the Fujitsu packs) and the numbers don't look too hot. But this whole hobby charger thing is completely new to me, so I need to play some more before I know how the numbers I get relate to reality.

Sorry about the “distraction” :)… but it was a good one, right, I hope :)?

So what kind of numbers did you get, so we can compare?

I’m doing a charge on one of them now, and then I’ll do a discharge to 3.0V (since I got help here… I turned the safety time off, and will be watching it “like a hawk”, esp. after this afternoon’s “adventure” (sparks, smoke, and burning odor).

Will post back…

Jim

I grabbed 5 at random to test but only finished 3 of them, but they did 1321, 1338, & 1340. 1A down to 3.0V. But, I haven't done discharge tests on any other brand/capacity cells to know how the numbers from the Turnigy relate to the advertised capacity.

Did you see the pic I posted in the other thread about the 'distractions'?

Hi,

No, sorry. Which thread was that? I’ve been going blonky with all of this charging/discharging stuff :).

BTW, do we know what these from the pack are suppose to be rated at (too lazy to check)?

Jim

Hi,

Re. distractions, was it post #94 on this thread (FYI - some 'new' Fujitsu laptop batteries)?

If so, that’s a good kind of distractions, right?

Also, I thought another person on the other thread just threw the Fuj/Pana batteries into their i4 charger (so less than 3 weeks)?

Jim

The first cell from the Fujitsu packs took 2901mAh on the first charge, haven't done a discharge test yet.

12 cells, 3 series sets of 4 cells in parallel, 9600mAh rating divided by 4 = 2400mAh.

Thanks. Our posts crossed, but I think I found the post/pic you were referring to, showing 2901 mAh :)…

Jim

P.S. Now you know what I’ve been going through the last couple of nights :)!

I haven't tried doing more than one at a time on the hobby charger yet.

I haven’t dared do that yet, too, so post back, either in this thread, or, maybe another thread, if you do that? Can you also include details of your setup, etc. if you do do that?

Going off of your sig, this is a learning experience…

Thanks,
Jim

comfy,

My charger, discharging @ 1 amp, is already at 1202 mAmps @ 3.42V, so it’s got a ways to go yet, so the capacity seems to be > 1200 mA.

I did a full charge before starting the discharge, and I have the safety timer is OFF.

Jim

comfy,

Here’re the final numbers for the one randomly selected (but good wrapper) battery from the pack. Again, my Accucell is set with safety time to “OFF”, for these, and both charge rate and discharge rate were set to 1.0 amps:

1st Charge: Time: 71:58, Ending Voltage: 4.20V (confirmed with separate DMM also), 597 mA

Discharge: Time: 147:39, Ending Voltage: 3.00V, 2257 mA

So, it looks like the capacity (down to 3.00V) for this battery is 2257 mA.

This’ll probably be the last one I do tonight…

Jim

OK, I’m a little confused. Are these the BAK cells that are showing 2200mah?

Marc.

Yes - though I haven't seen the docs that link 'BAK' to these blue cells marked with CJ. I couldn't find anything useful on google, though that's not unusual these days, what with their not-at-all helpful policy of replacing your search terms with what they think you meant instead.

Haha, yeah that’s Google.

So these look good then. Like I said I was going to buy one for my laptop so presuming they are all made by one manufacturer and use the same cells, I should by happy.

http://www.ebay.co.uk/itm/190776517081?ssPageName=STRK:MEWAX:IT&\_trksid=p3984.m1423.l2649

That’s one I was looking at. Do you think it’s the same?

Marc.

Looks identical.