Cheap battery mod save 5-6 pounds

Discussion in 'Motorcycles - Ride-NY' started by SaratogaLED, Apr 11, 2017.

  1. SaratogaLED

    SaratogaLED Leecher

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    The Lithium Iron batteries are getting cheap. I put the 1.25 pounder in the 1000RR and the 2 pounder in my wife's Civic. Starts both with ease so far. I left my bike sitting for about 2 months and it fired right up. The battery recharges in less than 2 minutes after starting the bike.

    $73, weighs 1.25 pounds

    $100, weighs 2 pounds


    IMG_20170217_173554692.jpg
     
  2. SaratogaLED

    SaratogaLED Leecher

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    I followed Doug's example and grabbed a MikeyMoto style rear rotor, although this one is the ebay version, weighs in at exactly 1 pound. That will shave off .75 pounds of rotating unsprung driveline weight which is worth ~8 pound sprung weight?

    ~$70 shipped

    rotor MM.jpg
     
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    Last edited: Apr 11, 2017
  3. capitalcrew

    capitalcrew Journeyman Staff Member

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    I didn't realize those lithium batteries were getting so cheap. I was looking at one for my race boat a couple years ago and it was more like 150-200 bucks. That's awesome.
     
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  4. SaratogaLED

    SaratogaLED Leecher

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    Kind of funny that they are cheaper than stock lead batteries, same for the Civic, and 25 pounds lighter for what its worth. Hopefully they will hold up for a few years at least.
     
  5. RocketPunch

    RocketPunch Grasshopper

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    I should do the rear rotor mod on my sv.
     
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  6. Ilya

    Ilya Leecher

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    I know in cars you can buy adapters or whatever if the battery is too small...etc...but how do bikes work? I probably need to get one anyway for my KLR and wouldn't mind losing a couple of pounds on the Vulcan S.

    EDIT: Or are these built the same size, just due to the materials alone are lighter? In that case, disregard my comment.
     
  7. capitalcrew

    capitalcrew Journeyman Staff Member

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    You find one that fits, they're just light as fuck.
     
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  8. Vovchandr

    Vovchandr Grasshopper Grasshopper

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    I had it on my wish list for years lol
     
  9. SaratogaLED

    SaratogaLED Leecher

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    My bike had the Yuasa YTZ7S stock and the WPS HJTZ7S lithium was a perfect fit and it fit under the stock rubber strap. But for the car the lithium battery was way too small so I strapped it down with zip ties and I had to adapt the battery post terminals to a ring terminal.

    It is worth mentioning that the $99 battery can start the civic easily, but it has small capacity relative to the stock battery for listening to the radio etc.
     
  10. capitalcrew

    capitalcrew Journeyman Staff Member

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    Don't they need a special charger too? I just bought a battery tender to keep my batteries fresh but I think the lithium ones require a different tender
     
  11. RocketPunch

    RocketPunch Grasshopper

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    Well, they don't make one for sv, just gixxer.
     
  12. Vovchandr

    Vovchandr Grasshopper Grasshopper

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  13. SaratogaLED

    SaratogaLED Leecher

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    It does seem that normal 12V trickle chargers dont give 12V LiFe batteries a full top off, but the bike itself will. The upside is these batteries should not need a trickle charger and should hold their charge all winter and fire right up in the spring. If your bike uses a lot of standby power you could disconnect the negative terminal during the winter.

    If you need to revive a dead 12V LiFe battery, one option is to start your car or bike and hook up jumper cables to the lithium. You can do it in increments if you are concerned about overheating it. Or you can buy a small 12V LiFePO4 charger.
     
  14. DouglasR1

    DouglasR1 Journeyman

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    I have had my Lithium battery for over two years. Only thing I have done is disconnect and bring in the house during the winter. I do have a trickle charger set up and plug it in from time to time during riding season. SaratogaLED, you forgot to mention the pimp factor of the rear rotor! :)
     
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  15. RocketPunch

    RocketPunch Grasshopper

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    I never trickle charge the MOTY battery, but I only it use it on my race bike. Battery holds its charge during the whole winter storing it in my house. voltage measure the same from the day I pull it out of the bike to the day I put it back in.

    The one one time I have to charge it was I accidentally left the transponder on and it drained the battery to the point that It won't start the bike, I revived it just by charging it with my 1.5A trickle charger at 10 mins increment and measure the voltage in between.

    As a street bike battery, IMO, it is not as robust as a AGM; you will have to monitor the battery closely. Also I won't recommend simply hooking it up to a trickle charge and just walk away and let it cook. If you've seen how violent when mobile phone battery igniting on YT, now imagine a battery that is the size of a brick.
     

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