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Shorai batteries

Discussion in 'Norton Motorcycles (Modern)' started by Fast Eddie, Dec 15, 2017.

  1. Fast Eddie

    Fast Eddie VIP MEMBER

    Oct 4, 2013
    It’s a big high comp motor with no decrompression facility, and none of us want big heavy car batteries on there.

    I guess there’s only so much the laws of physics can provide !
  2. worntorn


    Dec 22, 2006
    With a PB equivalent 18ah Shorai (LFX18) there is 6ah of actual storage in the battery .
    This is listed on the Shorai site but it's kind of in the fine print.
    With a 12 ah lead acid you have 12 ah of storage.
    So the Shorai will crank like an 18 ah lead acid battery but only for a short time.
    It's got to get the job done fairly quickly or it is spent. They have a high flow rate (this is the 18ah equivalent part) so they can provide great power, but there's not much of it!
    The lead acid battery you have now ( I'm assuming it's something like a 12ah) will grind away much longer.
    I found out about the tiny storage capacity of my 18ah rated LiFe battery when I was about 300 miles from home and charging stopped on my MK3 Commando. The charging had stopped long before that, but this is when the bike stopped.
    Roadside, I installed a spare, fully charged 18ah pb /eq LiFe battery thinking it would run all day. About 50 or 60 miles down the road the bike shut down again, low voltage.
    Fortunately I was at a summit and was able to coast about 5 miles down into a small town.
    Bought a battery charger, charged the lead acid battery overnight and made it home dead loss the next day, 200 miles on one charge.

    Last edited: Apr 5, 2019
    Welshrugby likes this.

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