TrustFire Protected 14500 3.7V 900mAh Lithium Batteries (2-Pack Blue)

Pros: Great cells that are protected. Useful size (About the same as an AA). Good runtime. Consistent size

Cons: Could be confused with a much lower powered AA cell

Other: As long as you can keep it straight that these are a LOT more powerful than a standard AA and have a devise that can handle the higher voltage- then these are an incredible bargain.

Pros: Great battery, great price! I use these with my Cree flashlight and they last forever. Much better than I expected them to be for the price I paid.

Cons: You can´t forget that they´re 3.7 volts! They will easily damage products designed to work with 1.5 volt AAs and have a similar size.

Other: Lots of juice!!! Get these if you need to power flashlights or any other 3.7 volt product for long periods of time.

Pros: Cheaper; Seems to work well.

Cons: Wider than similar Trust Fire 14500 sold under a different sku.

Other: Works, but a little too wide.

Pros: These batteries are "AA" size, but have 3.7v instead of 1.5v. When coupled with a flashlight made to accept either AA or 14500, you typically get brighter light, longer runtime, or both. I used one of these with Ultrafire sku.19187 , and it is noticeably brighter.

Cons: Being that they are the same size as AA, they could be confused with AA and you could fry something not made for the extra voltage. If you have kids, don't put it with your regular batteries.

Other: If you have an application for them, they are just the thing.

Pros: Reasonably well made, as far I can see. I have seen some pretty miserable cells in the past. Work as you would expect. Can make a lot of difference in the flashlights that support it.

Cons: The capacity of these is around 560mAh (tested with a 500mA discharge current). This is only around 60% of advertised capacity and much worse than I would have expected given the excellent performance of the sister cells:
TrustFire Protected 18650 Lithium Battery
http://www.dealextreme.com/details.dx/sku.5790
I am using a Trustfire charger:
TrustFire All-in-One Charger
http://www.dealextreme.com/details.dx/sku.4151

Other: I am happy enough with these to buy more, but I would like some with higher capacity.

Pros: cheap, easy to use, Protected.
None of these 6 batteries is inferior goods.
and...
cheap?
cheap.
Good. cheap!!

Cons: What a #uc$%g capasity!!!
It seems 500mAh ~ 600mAh.
It has horribly short runtime.
Not very good looking with + point.

Other: change your print 900mAh to 500mAh.

Pros: -Not overrated -Not oversized -Well built

Cons: None

Other: One reviewer said that these are identical to the more expensive sku#3435, except that they are slightly wider, creating potential fitment issues. I have several torches that accept 14500 cells, including a couple of K-106's (which at least one reviewer said was a tight fit with these cells) and all fit just fine. The capacity seems to have held up as well over 4 months of regular use. If there are slight differences between batches in the DX warehouse, I suspect it's more a matter of "chance" than the sku# you order, since the warehouse employees tend to grab whatever product is within reach since they can't tell the difference without using a caliper. Maybe I just got lucky (others have also then) but I can't see any reason to pay the extra $ to order #3435 unless I saw the difference myself. Even the reviewer that said these were wider only said they were "tight" in his K-106, not that they wouldn't fit. I haven't measured capacity, but at similar brightness, they seem to come close in runtime to my Duracell 2650mAh 1.2v AAs, which is roughly the same capacity, so I'd say they're around 700-800 mAh, which is pretty good. I wish there were more options in this cell size, but the trustfire/ultrafire cells seem to be the only rechargeables I can find. Hopefully some other manufacturer(s) will start making them and hopefully we'll start seeing some higher capacities become available. I found some 2600mAh primaries online, but they were at least 3 times as much and I hate primaries anyway lol.

Pros: These cells seem to work pretty well. Capacity seems a bit optimistic, but they are not too bad.

Cons: The biggest problem with these cells, is that they are 51.9mm long. The addition of the protection circuit adds a bit too much length for some, but not all applications. They do not fit in most of DX's plastic cases, because of the additional length, due to the protection circuit being added onto the end.

Other: Reasonable price, just make sure you can fit 51.9mm cells into your application.

Pros: Good price and build quality! Seem to hold a good charge over the last year of use. They have plenty of run time in my flashlight... I have no complaints about battery capacity, or anything else for that matter. I have plenty of spares, and if I get an couple of hours or so out of a charge, I'm well satisfied.

Cons: Nothing at all after a year of use.

Other: I think they are good batteries, at a good price. DX has never sold me a product I was not perfectly satisfied with.

Pros: same as sku.3435 but cheaper.
works well if you have enough space for it's extra length.

Cons: why?!! just why can't they make it with normal length? i just don't understand this. yes, in some "holes" they're fit well. but almost all of the normal battery holders are made for exact AA battery length.

Other: this one had a great chance to be a best-seller. but wrong lenght is killing it's potential