Battery Problems on the Nighthawk

My CB750 Nighthawk has been sitting for way too long now. We even had a couple of 40° F days lately and I couldn’t stand it anymore. I need to get on two wheels sometime this week, period! Watch my update here:

I knew that even after sitting on the tender for a while, it would give me the same problem that it had before. The motorcycle would just click and die when I hit the start button. Fuses were good, everything was fine but the battery.

So I pulled my battery and decided to take a look at it. Turns out it was completely dry. I’m not sure how this happened because with my other batteries they didn’t need maintained but once every 6 months or so. Regardless, that’s the situation now.

What I did was use some distilled water, a disassembled inkpen, and a shotglass to carefully fill the battery to where it is. I haven’t been able to find my battery tester since I moved, so I’m just going to have to guess after it sits on the tender for a while. If I can’t start it tonight with the topped-off battery, I’ll take it in for testing at AutoZone or something tomorrow.

4 thoughts on “Battery Problems on the Nighthawk

  1. ProDigit

    distilled water will get it up and running again.
    Your battery tender might actually keep the battery warm in winter months,
    With the cold, the water might be evaporating faster than without tender.
    In essence your tender might be doing just the opposite,
    getting your battery to an early death.

    Instead, just disconnect your batteries, and do a full charge once every few months.

    Once the battery has distilled water in it, it should work.
    If not, you might need to add acid instead. I don’t know where you can find battery acid;
    It’s sold in some places as a white powder, but might be very dangerous to touch!

    I’m sure in USA you couldn’t get it over the counter.

    • Hey, good to see you again.

      My roommate has some battery acid, in case I need it. Though I don’t know how to measure any of it, or how to tell whether I need it in the first place.

      In order to figure out where it’s at, I need to either find my tester or buy a new one. I let it sit for 5 hours on the tender tonight, which should have given me *something* to work with (http://charliebrokebi.wpengine.com/motorcycle-bad-battery-update-will-bike-start/).

      So in the morning, I’m going to throw it back on the bike again, and see what happens. I’m considering just upgrading to a lithium or gel battery but I’m not sure which I’d want yet, and I want to ride!

      What do you mean about the tender leading my battery to an early death? Also for the past month, it’s been sitting on the tender…I forgot that I left it hooked up.

      I get what you’re saying about the cold, though. I haven’t had that much evaporation with a battery before, through the winter, though.

  2. ProDigit

    The greater the temperature differential between inside the battery and outside temps, the more water evaporates from the battery.

    If your battery tender gives a too high voltage, it might make the battery hand warm, when the rest of the bike is cold to the touch, This is not good!
    In this case you should find another battery tender, that has a miniscule amp draw (eg: 12V, 500mA; or lower).
    Battery tenders are usually for slow charging over night.

    Keeping them plugged in, keeps the battery warm, and water evaporates.

    • Ah that makes sense. I think though I made the right decision in just replacing it. Now I don’t have to worry about the battery for at least two years!

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