Customer Reviews

502
3.6 out of 5 stars
Ultrafire 2pcs 3.7v 18650 3000mah Rechargeable Battery
Price:$6.48 + Free shipping with Amazon Prime
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118 of 122 people found the following review helpful
on July 28, 2012
Verified Purchase
I've measured the real capacity of these batteries with dedicated hardware, and it was only 1000mAh! so these are similarly fake, as other chinese batteries. BTW, 3000 mah cells so far are made by panasonic only, and here you can check their price: Panasonic Li-ion Ncr18650a Cell 3.6v 3100mah 1 pcs Flat Top Free Shipping Fedex From Japan So, do not be fooled by this battery. It may work well as test battery for flashlights/etc, but you get exactly what you have paid for.
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51 of 51 people found the following review helpful
on January 16, 2013
Verified Purchase
Purchased two units of two. Tested all cells with a Cellpro Powerlab 8 at 0.25C rate. Capacity average is 850mAh between the four cells. Cycled 5 times, no improvement in capacity.
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52 of 55 people found the following review helpful
on August 24, 2012
Verified Purchase
I bought these batteries to use with a high powered flashlight. Charged them a few time and after the 3rd cycle they failed. Useless. If you are buying batteries for emergency uses, buy reputable ones. BECAUSE IF THESE FAIL, THINGS CAN GET UGLY QUICK.
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23 of 23 people found the following review helpful
on October 12, 2012
Verified Purchase
made in china and it shows - hit or miss on quality and construction - out of 8 purchased 4 turned out to be dus within 3 recharges - retailer does respond promptly to replace but what's the point - same deal with replacements ... they die too quickly for a lithium cell
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23 of 26 people found the following review helpful
on February 22, 2013
I have had years of professional experience in testing batteries, from aerospace to hearing aid batteries. I know how to test batteries & I have the equipment. I tested these based on the standard slow 20 hour discharge rate, not a high rate which makes the batteries look even worse.

This battery company is basically running something like a scam. I bought a total of 6 of these at 2 different times. My tests show that on average, they don't even measure up to a 1/3 of the 3000 mAh level claimed by UltraFire. One went totally dead after using only once.

Furthermore, they only have about the same power level as found in a triple pack of AAA batteries.

Therefore, buying these batteries makes no sense at all. Save yourself time & trouble & stay with lights that use the triple pack of AAA batteries. Keep it simple......
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19 of 21 people found the following review helpful
on October 8, 2012
Verified Purchase
At first I was extremely impressed with the power of these batteries. The light seemed to last for weeks. When I finally went to change the batteries, all of them were dead. After charging two batteries, I used one for a few days and when I went to change it, the other was already dead. It says on the battery that the shelf life is 10 years. These batteries do not last 1 day on the shelf. The usage time seems longer than the storage time. If I were to charge 4 batteries (what I have) and went into the woods, by the time the first one was used up, the others would also be dead. What is the sense of having spare batteries? The company will not replace them. I have to pay postage to return them for only a partial refund. I opened the two packs of batteries to have two each that never did charge fully nor held what little charge the dim light had. Very disappointed in the batteries. The light itself is fine.
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32 of 38 people found the following review helpful
on August 15, 2012
Verified Purchase
I've bough several of these batteries from Amazon (various vendors)with most holding a good charge. However I did have one go bad after the first charging. There's one thing I don't quite understand. 2 of about 12 are marked Ultrafire 18650, look 'Almost' like my other Ultrafire 18650's BUT ARE NOTICABLY ABOUT 4MM SHORTER! They still work fine in my flashlights, but go figure! Chinese Quality Control or ??? at it's best!
There's nothing special about the 18650 (except it appears to be made only buy Ultrafire) that a pair of RCR123A's (rechargeable) or CR123A's (regular) can't do in LED flashlights as their internal circuits control the increased voltage of the dual 123's. An added bonus is that CR123's can also be used in such things as Alarm Systems, Smoke Detectors, CO Detectors, Weapons lights and the list goes on with more device type being added all the time. RCR123's are excellent in lighting devices. Amazon has several brands of CR123's and RCR123's. My experience is that they're all sbout the same as long as you purchase ones with an internal current contol (pennies more).
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16 of 18 people found the following review helpful
on July 25, 2012
Verified Purchase
I bought 8 batteries and all of them died after trying to charge them a second time. They survived the first charging and worked fine, but didn't survive a second charge. I kept 4 and gave 4 as gifts and exactly the same happened for all of them, using different chargers, at different times, by different people. You get what you pay for. I don't think they are protected, but I will try to find out.
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15 of 17 people found the following review helpful
on August 16, 2012
Verified Purchase
I ought these for my e-power ecig and one was doa but the other worked great... until the other day. I tested the non-doa one and it does not hold a charge. Very disappointing. Spend the money and get genuine Ultrafires with the holograms.
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8 of 8 people found the following review helpful
on October 6, 2012
Verified Purchase
UPDATE 11-20-12: Well the other set of batteries have now died. These batteries are a waste of money. Purchased Tenergy and they have worked well so far. I would NOT recommend these, they are unreliable.

I purchased two sets of these batteries to work in my flashlights. Charged up both sets and they worked fine. One set though drained real quick. Recharged them again and tried them in my flashlight and they wouldn't even light at low mode. Made sure they are charged and tried again. Still do not work. We will see how the other set fairs with more use, but one set is completely worthless. Will buy Tenergy next time. Would not recommend this brand.
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