Ultrafire 16340 3.6V Batteries (4-pack)

Pros: Great size. I wish there are more 16 size battery around with better quality. How about the 16670 for example.

Cons: Quality is not up to it. I have 2 cells out of four that could charged only up to 3.9V while the other two charged to 4.1V. If you placed these together, one cell will drained much quicker than the other.

Other: You can't beat the price but I prefer to paid a little more for some quality product.

Pros: 4 rechargeable cells for less $$$ than you would pay for 2 disposable primary's at a local retailer.

Cons: Overrated and inconsistent capacity. On my CBA II at 1amp I got 630mah 610mah 560mah and 1 cell at 270mah.

Other: After reading every one else's battery reviews on this site i knew these would be overrated cells but at this price I will be buying more. All of my cells charged to almost exactly 4.2v on my ultrafire wf-139 charger.

Pros: Affordable spare batteries

Cons: Build quality is not perfect

Other: It works and recharges

Pros: Great price for 4 cells. This cells will fit the Ultrafire 602C Q5 5-Mode LED Flashlight sku 10806 as the protected cells are too long.

Cons: Need to watch out when charging.

Other: Will buy more as the price is right.

Pros: Easy to use, got a good price. I'm using a Ultrafire WF-138 charger, which has a auto-off function. So the fact that these batteries are "unprotected" is no issue if your using this charger.

Cons: None really. 880 mAh Is a bit on the optimistic side but this is also mentioned in the header.

Other: Bought five packages o fout batteries for my Romisen RC-T5 4-Cree and RC-C3 Cree LED torches. They do the job for a reasonable price. Note: wise to invest in a good charger like the Ultrafire WF-138 (SKU 1236)

Pros: Very cheap for a package of four compared to what you would pay for ONE in any store. Works well with the recharger I bought Nano Li-ion Single 3.0V CR123A Charger sku 1191. It charges only one at a time and has an auto - off feature so its not such a bad deal that these batteries don't have the protective feature.

Cons: The set comes with four...two of the batteries i have are different from the other two in that they have a slightly longer positive end.

Other: For the price, you can't go wrong. The only thing i regret is not buying more. For the price I would like to know that I could run my little flashlight 24/7 because i have 20 more waiting to be used. Get em!

Pros: -Solid value. -Good build quality. -Great performance so far, through about 12 re-charge cycles. -Drives my 6P + SKU:6090 drop in nicely... very bright and decent run time too. -Maybe I got lucky, but all 4 of my cells are pretty evenly matched. Using my Ultrafire SKU:1251 charger, and digi-multi meter they all peak-charge at nearly the same time. Of course the charger cuts out at 4.2V automatically.
-Hold their charge pretty well, they don't self-discharge as much as I thought they would.

Cons: -Over-rated capacity.
-Unprotected, so they need to be monitored while charging. I use a multi-meter and check for voltage while they charge. You also can't deplete them all the way down, without added risk.

Other: -If you are familiar with battery charging-monitoring-matching principles and are disciplined enough to refrain from completely discharging them, these are a great value.

-If you are the type who just wants to charge / discharge them and forget about it... go for protected cells instead.

Pros: -Solid value.
-Good build quality.
-Great performance so far, through 5-6 re-charge cycles.
-Drives my 6P+SKU:11836 and WF-501B+SKU:6090 very nicely... very bright and decent run time too.
-Maybe I got lucky, but this is my second order of 4 and now all 8 of my cells are pretty evenly matched, and NO DUD cells in the batch. Using my Ultrafire SKU:1251 charger, and digi-multi meter they all peak-charge at nearly the same time. Of course the charger cuts out at 4.2V automatically.
-Hold their charge pretty well, they don't self-discharge as much as I thought they would.
-So I must be the luckiest DX member with 8/8 GOOD cells.
-I have nothing to complain about.... KNOCK ON WOOD!!

Cons: -Over-rated capacity.
-Unprotected, so they need to be monitored while charging. I use a multi-meter and check for voltage while they charge. You also can't deplete them all the way down, without added risk.

Other: -Members need to evaluate what "kind" of user they are...
-If you are familiar with battery charging-monitoring-matching principles and are disciplined enough to refrain from completely discharging them, these are a great value.
-If you are the type who just wants to charge them, run them till' they die and forget about it... go for protected cells instead.

Pros: This is my second set of batteries that I purchased after testinng the first set which I bought a few weeks ago.
The price is very encouraging for a 4-pack and externally the betery looks to be of good quality.

Cons: However, one of the batteries from my first order overcharged but thank God it did not burst into flames, however it did get extremely hot and shrunk the plastic sleeve.
As posted by DX, these cells are probably of about 500mah capacity as I have a true 600mAh cell that lasts 30 minutes on SKU903 but this cell lasts about no more than 25 minutes.

Other: Since these are affordable cells, I dont mind carrying extra batteries for extended usage times.

Pros: + Build quality is o.k. + Fits applications, where protected CR123As are too big + Cheapest rechargeable Li-Ion battery available

Cons: - One cell of four I got is different from the others: The two venting holes on the positive pole are missing. - The same cell looses its voltage quite fast and has significantly less capacity than the other ones. I realized this not until it got overly discharged to ~2.3V. After recharging, the cell still works, but it might have been damaged in one way or the other. - Not protected. Refrain from overly charging/discharging.

Other: Only buy these, if you know how to handle non-protected rechargeables, or if the protected cells will not fit your application. All in all, I am satisfied with my purchase.