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  1. #1
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    Possible bad magicshine head?

    i wonder if anyone else has run into this issue. I just got the magicshine 900 today from geoman. I charged the battery for 4 hours until the light turned green on the charger.

    I mounted the light on the bike and tried it out. I tried running it through the modes. It was on for 30 seconds at a time and on my 2nd or 3rd test it just stopped lighting.

    i have a multimeter and i tested the charger. It's putting out 8 volts. the battery is putting out about 4.8 volts. Anyone have a working unit and feel like measuring the output? on the charger/battery ?

    what;s odd is when i first plug it in, the light blinks but that's it. Any thoughts? I ride early in the morning and was very much looking forward to the magicshine. Anyone know how reliable they are long term? I'm a bit concerened.

    I did contact geoman, but it was about 4:45 Colorado time; a bit close to closing time. I'm sure they'll contact me tomorrow.

  2. #2
    Senior Member socalrider's Avatar
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    been using the original for over a year with no problems other than the batteries holding less of charge but that is the norm for all lights that get used quite a bit.. I'm sure he will get back to you soon..

  3. #3
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    i'm sure they'll get back to me tomorrow, I've heard very positive things about them. Thanks for the reassurance about durability, one tends to worry when things like this happen.

    I ride in the morning before the sun comes out and i'm really looking forward to getting the magicshine up and going. Bummer I'll probably have to wait another week or two (i'm sure they'll want me to ship it back before they send a new one).

  4. #4
    I am a caffine girl colleen c's Avatar
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    Quote Originally Posted by malux View Post
    i have a multimeter and i tested the charger. It's putting out 8 volts. the battery is putting out about 4.8 volts. Anyone have a working unit and feel like measuring the output? on the charger/battery ?
    My charger puts out 8.53 volts measure with my calibrated Fluke VOM. Not sure what my battery open circuit voltage is now that it is near the end of it life cycle, but as I recall from memory, I get 8.3 to 8.4 volt right after a full charge when the battery was new. I suspect your problem is the battery pack and not the light head.

    One interest note is your charger output at 8v. That seem to be about 0.4 volt to low unless your VOM is not calibrated correctly. Try to get a second volt reading with another digital VOM to see if your digital meter or the charger is at fault or if you don't have another meter, then try test a new 9v alkaline battery and see if it reads low.
    "Difference between a well dressed cyclist riding a two wheeled bicycle and a badly dressed cyclist riding a Recumbent is only a-tire"
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  5. #5
    Seņior Member ItsJustMe's Avatar
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    The battery should be putting out more than 4.8 volts. Mine's at 7.8 volts right now and it's not freshly charged.
    Work: the 8 hours that separates bike rides.

  6. #6
    Senior Member Richard Cranium's Avatar
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    No doubt - something's not right. Make sure you double-check your meter's test leads and fully understand how the scales on your meter function.

    Like others have mentioned, the chargers from Dinotte and MagicShine will supply ~8.5V. The Magicshine chargers can deliver 1.8 amps and the Dinotte a little over 1.5A. Similarly, healthy batteries will produce a "green light" - indicating fully charged anywhere above 8.4V. If a battery is left on a charger for two or three hours after "green light" - it will usually reach 8.5V.

    And be sure to sort of "work" the connectors when connecting the charger. The charge indicator light should always be a steady red or steady green. You should never see blinking or pulsing of the light during charge.

  7. #7
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    Thanks all, I double checked the battery output and made sure I had solid lead contact when I tested it this time. It was putting out about 8.3 to 8.4.

    So it's not the charger or the battery, it's definitely the head. It blinks on so I'm thinking there must be some sort of bad limiter circuit somewhere.

    Geoman contacted me last night (wow!) and they're sending a replacement head today.

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