From reading around this there are a lot of fakes out there. A lot seem to come from old laptop batteries http://www.torchythebatteryboy.com/p/18650-batteries-chargers.html. Ultrafire don't have a great reputation.
Thanks for this, useful reading. Based on their findings I took the wrap off the battery, disappointed to find it looks new rather than some battered old second thing. Will try another brand!
@efb started
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From reading around this there are a lot of fakes out there. A lot seem to come from old laptop batteries http://www.torchythebatteryboy.com/p/18650-batteries-chargers.html. Ultrafire don't have a great reputation.