I purchased some UltraFire 4000mAH batteries with flashlights. One is a one cell flashlight and the other is a 2 cell flashlight. One of the batteries does not work and I've since learned from this site that they may be fake. In fact the do say "Sheef-life around 10 years" on the label which another user pointed out on a fake. My question is several users have mentioned these batteries being dangerous and being dangerous in a multicell use. What is the danger of using these cells? If they just go dead - I'll just learn and not buy any more of this brand. However if there are other dangers like the recent airliner fire problems with lithium batterise I won't use them any more. Thanks in advance for your help.
Ted12
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Ted12
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Hey everyone,
Just thought I would pass this along to any new people to the board. About a year ago I bought some Ultrafire 3000mah 18650's off ebay for about $3 ea shipped. They turned out to be about 2250mah but for the price I didn't complain too much. So about 6 weeks ago I ordered some more some protected and some not, 2 separate sellers on Ebay. I got out my Imax B6 charger and did some discharge tests at 1A and1400mah was the best. A couple where dead and some came in at about 70... yes 70mah. I opened them up and this is what I found. NONE of them match!
Clearly recycled, old spot welds where ground off. The unprotected batteries where not even 18650's they had some weird thick plastic cover to make them thicker.
These things could be really scary in a multi cell flashlight! I did get a full refund from both sellers, so if you get any fakes by all means ask for a refund and let other people know, these batteries are to dangerous to play around with.