18650 mAh

[sb56637]

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18650 mAh

Newbee here and would appreciate some advice. Been reading bad things about cheap ultrafire 18650’s etc… has anyone heard of these? Amazon.co.uk worth looking at safety wise? Also I believe higher mAh means longer runtimes but would going for say 2600mAh’s over 3100’s make a skyray king less bright? or would it put out the same sort of lumens but just for a lesser run time before it started to dim? Again sorry for my ignorance