TrustFire Rechargeable 3.7V "5000mAh" 26650 Li-ion Batteries (Pair)

Pros: Cheap. The batteries are not expensive, compared to others. Those batteries were suggested by a friend who is into LiIon-batteries.

Cons: The capacity is much smaller than stated. I wanted to use the battery combined with a USB-adapter to charge my cellphone (samsung galaxy SII) when on the road. 5 Ah should be easily enoth to charge it twice. However, the battery manages to charge it only once, even when fully charged. I am not content with it.

Other: In my eyes, this is *NOT* a 5Ah battery. It looks like its a fake.

Pros: Real capacity of 4500 mA. Protection works at 6 A. At this point, in my opinion, the best batteries in terms of price / quality. The best models have 18 650 3100, 3400 mA, with cost twice as much.

Cons: For this size could and more capacity to do. A thin film (with the active operation can close to the body)

Other: Worth taking!

Pros: Probably best 26650 battery for good price. It have much more capacity and can give much more current than every 18650 battery. It contains the protective circuit that minimalise the chance of damage.

Cons: The 5000mAh capacity is not real. The real capacity is about 4000mAh. The price should be little bit lower too, but the maker probably knows that here are not better batteries of this size.

Other: I wish that Samung, Panasonic or Sanyo make batteries in this size. These should have more than 5000mAh in real.

Pros: Reasonable milliamperage though nowhere close to the advertised "5000mAh"! I mainly ordered them so my high power flashlights would, hopefully, last longer.

Cons: Over priced, in my opinion, with suspect build quality. Advertised amperage is over-optimistic. Shrink wrap quality is not good; the wrap on 2 out of 4 batteries split open at the negative pole allowing the protection circuits to hang down loose.

Other: Buy them only if you're into gadgetry or they're on your must-have list, else go with regular 18650's or try some of the other brands.