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Regulator Voltage vs. Lithium-ion (Shorai) Batteries

Discussion in 'Norton Motorcycles (Modern)' started by SgtUSAF80, Jul 29, 2018.

  1. SgtUSAF80

    SgtUSAF80

    Joined:
    Nov 21, 2017
    I came upon some information today for those of us with the Shorai batteries and I wondered about its accuracy. The 961 Voltage Regulators have a range of 14-15V. The ideal voltage set point for Lithium-ion batteries is 14V (plus or minus 0.2 volts). Supposedly, the standard voltage set point of 14.5-14.7 is too much for a Lithium-ion battery and can lead to damaged internal components in these batteries. How much damage and how quickly this can happen was not mentioned in the information that I read.

    Any thoughts/comments?
     
  2. TonyA

    TonyA

    Joined:
    Jan 16, 2015
    My Shorai is still good after 2+ years of use.
     
    SgtUSAF80, MxMartin and Raphi like this.
  3. Raphi

    Raphi

    Joined:
    Aug 17, 2015
    Mine too, but regulator voltage is normally less than 14V on my bike...
     
  4. lcrken

    lcrken VIP MEMBER

    Joined:
    Mar 15, 2009
    The Shorai LFX battery manual says:

    "Do not allow charge voltage in excess of 14.8V."
    From the Shorai charging guide:

    "When a Shorai LFX battery is fully charged it will measure a resting voltage of ~14.4V. Floating the LFX battery voltage at 14.6-14.8V for 24 hours can help to improve capacity and slow the self-discharge rate. "

    That would seem to indicate that charging at 14.5 - 14.7 volts is ok.

    Ken
     
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  5. TonyA

    TonyA

    Joined:
    Jan 16, 2015
    Hello Again Raphi , When you are going 70 mph what does the VDO voltage read ?
     
  6. Raphi

    Raphi

    Joined:
    Aug 17, 2015
    13.3V lights on / 13.5V lights off
     
  7. TonyA

    TonyA

    Joined:
    Jan 16, 2015
    I will let you know what I get.
     
  8. KiwiNeill

    KiwiNeill Guest

    icrken

    I,ve had a large Shorai in my Commando since 2014 and charges at 13.5 to 14v with 3 phase Lucas alternator and Sparx reg/rec on analogue voltmeter.
    My Yamaha Shorai (much smaller) since last March, and 7000 miles on, charges at 14.3 - 14.5v with original electrics.
    Both bikes ridden with lights on and no problems to date but always carry compact Auperto power pack which will start and power both in case of battery malfunction, and charge my phone and ipad....
     
    Last edited by a moderator: Jul 30, 2018
  9. mikeythebiker

    mikeythebiker

    Joined:
    Feb 11, 2012
    Alton starter and Shorai battery (73 850 commando) installed and charging rate is well above 15 volts w/o headlights on. Thought of adding another Zener with a heat sink out of a computer. Any intelligent thoughts will surely be accepted. Thanks to all! Nortons Rule!
     
  10. Bernhard

    Bernhard

    Joined:
    Apr 20, 2011
    Dirty connection(s) ?
     
  11. Fast Eddie

    Fast Eddie VIP MEMBER

    Joined:
    Oct 4, 2013
    Raphi is talking metric volts...
     
  12. jaydee75

    jaydee75 VIP MEMBER

    Joined:
    Jul 2, 2012
    The way I understand it, a Shorai will live just fine at 13.3 volts charge, it just isn't fully charged. There's still plenty of power available, just not all of it.

    Jaydee
     
  13. Bernhard

    Bernhard

    Joined:
    Apr 20, 2011
    Dirt on the connectors and/or green/brown/black copper coloured wires will give a resistance to the amount of volts going into the battery from the generator- normal reading on multimeter on battery at say 3000 rpm with no indicators on but light switch both on and off should be 14.3 to 14.7 volts, any less at these revs, there IS something wrong, no question.
     

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