Li'l help please...I'm an idiot... - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 28 Old 05-15-2010, 02:10 PM Thread Starter
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Li'l help please...I'm an idiot...

and left my key "on" in the garage overnight after checking miles ridden yesterday. Battery is 100% dead and I just hooked my Battery Tender Junior up to it. Battery Tender Junior is flashing red indicating "Charging" and I just want to confirm that my Battery Tender Junior has the "oomph" to fully charge up my completely dead battery. Any guestimates as to how many hours it might take? I was hoping to ride today...

Thanks for any insights.

2013 DL650A
2009 DL650A-Gone to a good home
2009 KLR-Gone to a good home

Last edited by PNWStrom; 05-15-2010 at 02:43 PM.
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post #2 of 28 Old 05-15-2010, 02:42 PM
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In my opinion, you will not be riding today. Also, that battery tender is not designed for slow charging a flat dead battery. It is for maintaining a charged battery or charging a battery with 11.4volts or more. You are probably shortening the life of the charger.

I think you ought to decide if it is better to hook up to a proper motorcycle battery charger (off the bike) or just replace the battery. Don't charge the old battery at more than 2 amps. Certainly don't charge it in (hooked up to) the bike.

2c...


From the book: (my bold)

Therefore, a fully discharged 15 Amp-Hour battery will
take approximately 16 hours (to charge)


WORKING WITH A DEAD BATTERY OR A BATTERY WITH A VERY
LOW VOLTAGE:
If you try to charge a dead battery having a voltage below 3 Volts, the
BATTERY TENDER® CHARGERS will not start to charge because an internal
safety circuit prevents the battery chargers from generating any DC output
voltage.

NOTE:
If a 12 Volt, Lead-Acid battery has an output voltage of less than 9 volts when
it is at rest, when it is neither being charged nor supplying electrical current to
an external load, there is a good chance that the battery is defective.
As a
frame of reference, a fully charged 12-Volt, Lead-Acid battery will have a reststate,
no-load voltage of approximately 12.9 volts. A fully discharged 12-Volt,
Lead-Acid battery will have a rest-state, no-load voltage of approximately 11.4
volts. That means that a voltage change of only 1.5 volts represents the full
range of charge 0% to 100% on a 12-Volt, Lead-Acid battery. Depending on
the manufacturer, and the age of the battery, the specific voltages will vary by
a few tenths of a volt, but the 1.5-volt range will still be a good indicator of the
battery charge

DL650K7, lightly farkled :mrgreen:

Last edited by 510ebl; 05-15-2010 at 02:52 PM.
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post #3 of 28 Old 05-15-2010, 02:46 PM
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If it were me I would jump it from my car or truck, then go for about a 4 hour or so ride, and you'll likely be fine. It's freakin' beautiful around here today, don't waste it like I have to!

Rob

Ride every day, it's good for you.
07 650A | KLR250(x2) | KLR650 | DRZ400 | FJR
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post #4 of 28 Old 05-15-2010, 02:54 PM
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I agree about not wasting the day, but really don't like the idea of charging a battery that is that dead with the bike's charging system. To each his own though. YMMV, and all that...

DL650K7, lightly farkled :mrgreen:
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post #5 of 28 Old 05-15-2010, 03:00 PM
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Accidentaly turned the key to the park light position and left it on for about 12 hours.
I just got a jumpstart from a car and drove for about 1 hour.
No porblems afterwards.
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post #6 of 28 Old 05-15-2010, 03:11 PM
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If you jump start your bike from a car I would be very careful. The amperage in the car battery is significantly higher and can fry electronics on your bike.

Keep the Rubber Side Down.
Jim
Present Rides
1986 XR600R,1986 VF1000R,1999 CBR1100XX,2006 CRF450X,2007 DL1000 V-Strom
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post #7 of 28 Old 05-15-2010, 03:23 PM Thread Starter
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"I think you ought to decide if it is better to hook up to a proper motorcycle battery charger (off the bike) or just replace the battery.

A new battery is $80 and this one is a year old, an appropriate charger from Harbor freight is $32.

Is the life expectancy of my current depleted battery compromised by killing it as I did? Is it worth recharging?

Should I just pay the stupidity tax and buy a fresh battery?

Thanks.

2013 DL650A
2009 DL650A-Gone to a good home
2009 KLR-Gone to a good home
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post #8 of 28 Old 05-15-2010, 03:33 PM
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Regardless of all the other factors to consider, yes, the battery on the bike now has a shorter life expectancy. If it were mine (and it did recover) it would be living in my lawn tractor from now on.

Maybe I just don't like pushing motorcycles home anymore...

How many volts are you now reading across the terminals? That may help you to decide.

DL650K7, lightly farkled :mrgreen:
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post #9 of 28 Old 05-15-2010, 03:36 PM Thread Starter
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Quote:
Originally Posted by 510ebl View Post
Regardless of all the other factors to consider, yes, the battery on the bike now has a shorter life expectancy. If it were mine (and it did recover) it would be living in my lawn tractor from now on.

Maybe I just don't like pushing motorcycles home anymore...

How many volts are you now reading across the terminals? That may help you to decide.
1.96V

Sounds like I should just replace it?

2013 DL650A
2009 DL650A-Gone to a good home
2009 KLR-Gone to a good home
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post #10 of 28 Old 05-15-2010, 03:38 PM
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No expert on the subject, but I would just ease the battery up with the Battery Tender to anything more than 11.5V measured with the Battery Tender disconnected, jump start it from a car without leaving the cables connected any longer than necessary, go enjoy the day, put the Battery Tender back on it when you get home.

'01 TTR125L, '01 plated WR426, '00 Super Sherpa, '81 KM100, '80 SR500, '78 XS650, '06 DL650, '10 MG V7 Classic, '12 MG Griso 8V SE, '12 VN1700 Nomad, dearly departed (totalled) '03 DL1000
-John
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