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Discussion Starter · #1 ·
Sorry if already answered, but googled and searched the forums, all I could find was on battery tenders and trickle chargers and idling charge. What I'm trying to figure out, is how long does it take for the FZ6 to fully recharge the battery when running over 5k rpm? A 30 min ride, 3 hours, longer??


Situation: A month or two ago, turned engine off but left key in run and bike died after just 3-5 min, wouldn't start back up. Got it bump started and no issues for awhile.

About a week ago, bike refused to start - fuel bump whine came on, tach came on, tried to turn over (sounded decently strong), but just couldn't make it. It had been cold overnight, but it wasn't as cold when I was trying to start it. Got it bump started and rode. 2 days later, wouldn't start again. Got it bump started again, but battery was from summer '09 (per label), so just bought a brand new battery from Batteries Plus and put in a few days ago. Tried to start it up a few times, started up super strong, but didn't ride it.

Now today, went out, and same thing - tries to turn over but can't and eventually completely dies! Argh. Bumped it, let it run for a few min, multimeter voltage showed ~12.4 idle and ~13.4 revved I believe. Checked 30A main fuse under gas tank and doesn't look blown. Turned off and wouldn't turn back on. Bump started again, now I'm annoyed.

From the voltages it looks like charging system is working right? No alarms/extra lights; only mod is a stebel nautilus airhorn I've had on it for a long time. I'm a little handy but not overly..


Any suggestions?
 

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multimeter voltage showed ~12.4 idle and ~13.4 revved I believe.

From the voltages it looks like charging system is working right?
NO, not even close.

A modern AGM battery reads 12.8 when new and fully charged......so it should read at least that at idle.
13.4 is just "float" voltage which will just maintain a charge but not add any.
It needs to be over 14 to charge much.

SO.....get a charger and leave it connected overnight.
Disconnect the charger and let it sit for a few hours and measure the battery. If less than 12.8, your new battery is bad or there is a short in the bike somewhere.
If that is good, then start it up and check the voltage again. If less than 13.8, your charging system needs work.

There is no one right answer to your original question because it depends too much on how old the battery IS and how flat it was to start with. After a discharge episode, you can't depend on the battery to recharge fully just by riding.
 

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Discussion Starter · #3 · (Edited)
NO, not even close.

A modern AGM battery reads 12.8 when new and fully charged......so it should read at least that at idle.
13.4 is just "float" voltage which will just maintain a charge but not add any.
It needs to be over 14 to charge much.

SO.....get a charger and leave it connected overnight.
Disconnect the charger and let it sit for a few hours and measure the battery. If less than 12.8, your new battery is bad or there is a short in the bike somewhere how long does it take to charge a motorcycle battery this site covered this articlle check now bikerwhizz?
If that is good, then start it up and check the voltage again. If less than 13.8, your charging system needs work.

There is no one right answer to your original question because it depends too much on how old the battery IS and how flat it was to start with. After a discharge episode, you can't depend on the battery to recharge fully just by riding.
thank you so much for such a response and guidance
 

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QUOTE:

"After a discharge episode, you can't depend on the battery to recharge fully just by riding."

**
That's been my experience with automotive batteries-- if they're fairly new & within the warranty, then You've got about a 66% chance that a 30 minute or longer ride on the highway will recharge it and it will be back in service for years.

But about 1/3 of the time it either won't work again or it'll be damaged with poor performance from that point forward.

For an old car battery that gets fully discharged and is dead .... I usually have to buy a new one 'cause it'll never work right again.
 
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