Cygolite Dualcross spare battery project- Mtbr.com
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  1. #1
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    Cygolite Dualcross spare battery project

    I would like to make a cheap spare battery or two for my cygolite LiIon for a 24 hour race. I would like to use alkaline or cheap rechargeable AAs that I already have. The light currently runs off a LiIon battery pack that is 4.2v fully charged. I assume it's a 3.7v pack. Anyone know if the light will handle 3 alkalines (4.5v) and/or will it run OK on 3 rechargeable AAs (3.6v) or for that matter 4 rechargeable AAs (4.8v). Cygolite wants $70 for a spare battery.
    Thanks in advance

  2. #2
    Spanish biker
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    Hi, why you don't buy a "generic" li-ion battery pack??

    Greetings -Saludos

    msxtr
    Warning!!! my english is very very bad, sorry.

    Easy DIY led light1
    Easy DIY led light2

    The Beast!!!

  3. #3
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    Because a generic pack is still ~$20. I would not be sure on the charger being compatible so I may have to purchase a new charger. I should be able to piece together a AA pack for a few bucks. I will only need to use it a few times, maybe no more than once depending on how my 24 hr. race goes!

  4. #4
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    Quote Originally Posted by Andy13
    Because a generic pack is still ~$20. I would not be sure on the charger being compatible so I may have to purchase a new charger. I should be able to piece together a AA pack for a few bucks. I will only need to use it a few times, maybe no more than once depending on how my 24 hr. race goes!
    A generic Li-ion pack would cost way more than $20 USD. An alternative that might work would be to use 4 - AA 1.2volt NiMh Eneloops in series ( battery holder available at any Radio Shack ) or through Dinotte. That would be 4.8volts total. Peak voltage of your current battery should be 4.2volts. I doubt the additional voltage would be a problem although I could be wrong. Four AA Eneloops in series are still only 2000mah though. Run time would not be too long. Li-ion's would give much better run times. Regardless, you're going to have to spend more than $20 unless you already own some AA NiMh batteries. If it were me I would use 3 or 4 18650 Li-ions ( 2500mah ea.) in parallel and either build a battery holder or buy one of the Turboferret 18650 battery holders. ( sorry, I don't have the link or know how much he wants for one ) The Trustfire 18650 Li-ions sell for about $5 a piece on D/X.

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