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Position (+/-) of battery in flashlight

  • Alejo Monday, July 27, 2015 5:05 AM Reply
    1) What are possible results of putting in a battery "upside down"?
    2) How can I tell what is the right way,? for example + down or up?
    3) It seems simple how could I not know this? Some flashlights, etc. clearly indicate the correct orientation but not all.
    What occasioned this was my putting in a newly charged 18650 battery in a SSC P7 Ultrafire that had previously worked. Now it doesn't. I THINK I put the battery in negative first, positive on top by the clicky. Buy would not bet.
    I apologize in advance for wasting time if this is a real no-brainer but if the positioning "shorted out" the light somehow I do not want to repeat my mistake.
    Thanks, Alejo
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  • cyclist Moderator Monday, July 27, 2015 5:45 AM Reply
    Its not a silly question, Im sure everyone has been there at some point.
    I have fried a flashlight/driver by putting a battery in the wrong way, after that, I now know that the battery always goes in positive end first for 99.99% off flashlights.
    With more expensive lights, there is usually some protection for inserting the battery the wrong way, but that is very rare with cheap Chinese lights.

    Unfortunately, it is very common for the factorys to just get the products out as fast as possible with very little, if any, info on how they work.
    That is why DX forums are full of customers asking how the item they bought works.
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  • desolder Top 10 Forum Poster Wednesday, July 29, 2015 12:38 AM Reply
    Most likely the driver burned out, however the LED probably survived. So you should be able to fix the light by just replacing the driver. DX has lots of different drivers available. You'll need to measure the driver diameter then pick one which will fit, and has compatible electrical specifications.
    What's up with the scrubbed LED driver IC markings?
    What are they trying to hide?

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