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  1. #1
    Anytime. Anywhere.
    Reputation: Travis Bickle's Avatar
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    Jan 2004
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    How to calc burn time?

    I have an old blt helmet light with a 15 watt halogen bulb replacing the original 10 watt. I just picked up a 6 volt 8.5 amp/hr lead acid battery to replace my old 7 amp/hr. Is there a way to calculate the approximate burn time?

    This setup is an interim measure until I buy a new light, probaly one of the new led's that are conming out.

    Thanks.
    I got some bad ideas in my head.

  2. #2
    Singletrack Daydreamer
    Reputation: rockymtnway's Avatar
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    Nov 2004
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    Burntime = Volts X Amp Hours / Lamp Wattage

    6v X 8.5ah = 51 Watt Hours / 15w bulb = 3.4 hours

  3. #3
    Anytime. Anywhere.
    Reputation: Travis Bickle's Avatar
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    Thankyou. 3.4 hours should be fine for now. They had bigger batteries but the weight of the lead acids is prohibitive.
    I got some bad ideas in my head.

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