I received a pair of Ultrafire 10440’s years ago (5+) as a free gift on a purchase on Dealsextreme if i remember correctly and only used them recently for the KD Buckle and found they were still working after all those years.
The EFEST 10440's are far better - mtnelectronics.com EFEST. RMM shows the HKJ's comparisons, comparator here: http://lygte-info.dk/review/batteries2012/CommonSmallcomparator.php. The UltraFire's in capacity, stay with the EFEST up til 0.5A, but higher, the UltraFire's fade away.... I still have a bunch of UltraFire's, but really prefer the EFEST's. There's not much choice out there though.
That's always a problem with these very low capacity cells. The best charger is one with a 200-250 mA charge rate. The UltraFire's, even though they say 600 mAh are actually about 350 mAh, so normally you want to charge at or below 1/2 the capacity (0.5C), though some say up to 1C.
I use the OPUS BT-3100 for these now, but the XTAR MC0 looks like a nice quality, cheap charger for this: mtnelectronics MC0 for $5.90. Also the "VP" series of XTAR's Richard sells will work fine. Richard is listing these chargers the right way - he won't say a charger supports 10440's unless it supports a low enough level. Others advertise chargers supporting 10440's just because they can physycally fit -- big difference...
If you have a charger that can charge LiFePO4, I have been using the Soshine LiFePO4 AAA’s in my buckle with a good increase in brightness over Alkaline. Not as much as a 10440, but runs cooler too… Just an idea.
That wouldn’t be the main target of the production run.
Binning takes the output of the run and sorts them by color and efficiency.
The odd bins collect the emitters that came out a bit off the target; they get sold cheap by discounters to people willing to buy small lots or single items.