Battery Issues - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 20 (permalink) Old 02-20-2011, 06:16 PM Thread Starter
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Battery Issues

I believe I am in need of a new battery. This one is 4 (or 5) years old. Bought it from Advance Auto Parts. I see in some of your signatures, "MF Battery" what is that? How long do these batteries last? am I overdue? Is it worth the expensive $100 battery? or just buy the $40 one that i did 4 years ago. When i start it, my 12v meter drops to 4 or 5 volts, its weak, and it wont charge. once started via jumping, the system is at a steady 13v at 3,000 rpm. is that ok?

Thank you

1986 Vn750
18,800 miles, and counting
Bone Stock
New cam chain tentioners
all fluids changed
Spline Lube
windshield
Engine Guard
B-stone S11 RWL-stock sizes
*wanted*
New grips

2001 Vn750
13,100 miles, and counting
spline lube
Bridgestone S11 100/90
Shinko 170/80
rear end oil change
aftermarket mirrors
windshield
otherwise all stock
*anticipated mods*
Engine Guard
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post #2 of 20 (permalink) Old 02-20-2011, 06:27 PM
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MF = Maintenance Free.. is it really worth it... I was very very skeptical of spending that kind of money on one, then I got a recommendation from one of the senior members to get one off of ebay for a lot less than I could get in the stores... got it, installed it, fixed a lot of issues i didn't even know I had, like hot start, then went out and bought a second one for my other bike. I will never use a conventional battery in any of my motorcycles again.
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post #3 of 20 (permalink) Old 02-20-2011, 07:00 PM
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Quote:
Originally Posted by 1986vn750 View Post
I believe I am in need of a new battery. This one is 4 (or 5) years old. Bought it from Advance Auto Parts. I see in some of your signatures, "MF Battery" what is that? How long do these batteries last? am I overdue? Is it worth the expensive $100 battery? or just buy the $40 one that i did 4 years ago. When i start it, my 12v meter drops to 4 or 5 volts, its weak, and it wont charge. once started via jumping, the system is at a steady 13v at 3,000 rpm. is that ok?

Thank you
Your old battery is shot. The 13v reading when the bike is running is from the stator/alternator.

Here is a good MF-AGM battery at a current price of ~$61.
http://cgi.ebay.com/ebaymotors/Deka-...mZ270282472155

Technically it is a misnomer to call an MF-AGM battery "sealed".
It is Valve Regulated Lead Acid technology (VRLA), but the (gas) pressure relief valve is small and can be difficult to locate.

It is "sealed" in the sense that it will not spill liquid if it is tipped over.

For more info search VRLA and/or read this from Wikipedia:
http://en.wikipedia.org/wiki/VRLA_battery

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html

Last edited by OlHossCanada; 02-20-2011 at 07:12 PM.
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post #4 of 20 (permalink) Old 02-20-2011, 07:04 PM Thread Starter
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Quote:
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The 13v reading when the bike is running is from the stator/alternator.
I knew the 13v was from the bike's charging system, is that sufficient? i read somewhere that at 3,500rpm it should be 14.5v. is this true?

1986 Vn750
18,800 miles, and counting
Bone Stock
New cam chain tentioners
all fluids changed
Spline Lube
windshield
Engine Guard
B-stone S11 RWL-stock sizes
*wanted*
New grips

2001 Vn750
13,100 miles, and counting
spline lube
Bridgestone S11 100/90
Shinko 170/80
rear end oil change
aftermarket mirrors
windshield
otherwise all stock
*anticipated mods*
Engine Guard
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post #5 of 20 (permalink) Old 02-20-2011, 07:20 PM
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Quote:
Originally Posted by 1986vn750 View Post
I knew the 13v was from the bike's charging system, is that sufficient? i read somewhere that at 3,500rpm it should be 14.5v. is this true?
13v from the charging system at 3,500 rpm seems low to me.
The electrical gurus do say 14.5 volts at 3500-5,000 rpm or so is desirable.
Does the voltage rise closer to 14 if you rev the engine higher to 4, 5 or 6k rpm?

A nominal 12 v battery has 6 cells that should produce 2.2 v each at rest, or 13.2 v total.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/showthread.php?t=9127

Last edited by OlHossCanada; 02-20-2011 at 07:29 PM.
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post #6 of 20 (permalink) Old 02-20-2011, 07:39 PM
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Check your voltage again after you replace the battery. Your old battery may be dragging the voltage down.

And I agree about the MF battery. I bought one after all the recommendations here. Definitely makes a difference.
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post #7 of 20 (permalink) Old 02-20-2011, 09:59 PM Thread Starter
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it does climb a little when reving, i think you're right, the very weak battery is pulling some of the juice from the charging system so it reads low (13v)

1986 Vn750
18,800 miles, and counting
Bone Stock
New cam chain tentioners
all fluids changed
Spline Lube
windshield
Engine Guard
B-stone S11 RWL-stock sizes
*wanted*
New grips

2001 Vn750
13,100 miles, and counting
spline lube
Bridgestone S11 100/90
Shinko 170/80
rear end oil change
aftermarket mirrors
windshield
otherwise all stock
*anticipated mods*
Engine Guard
1986vn750 is offline  
post #8 of 20 (permalink) Old 02-20-2011, 11:39 PM
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[email protected] rpm, [email protected] rpm, 12.0-13 @ idle-2500 rpm


this is just a general rule of thumb. You know you have a bad battery, start there and worry about the R/R and stator after you get the battery fixed.
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post #9 of 20 (permalink) Old 02-21-2011, 07:39 AM Thread Starter
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thanks, ordered a new battery last night from ebay. Ill give it to my dad as an early birthday present

1986 Vn750
18,800 miles, and counting
Bone Stock
New cam chain tentioners
all fluids changed
Spline Lube
windshield
Engine Guard
B-stone S11 RWL-stock sizes
*wanted*
New grips

2001 Vn750
13,100 miles, and counting
spline lube
Bridgestone S11 100/90
Shinko 170/80
rear end oil change
aftermarket mirrors
windshield
otherwise all stock
*anticipated mods*
Engine Guard
1986vn750 is offline  
post #10 of 20 (permalink) Old 02-21-2011, 09:25 PM Thread Starter
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How long has your MF battery lasted? do u keep it inside in the winter?

1986 Vn750
18,800 miles, and counting
Bone Stock
New cam chain tentioners
all fluids changed
Spline Lube
windshield
Engine Guard
B-stone S11 RWL-stock sizes
*wanted*
New grips

2001 Vn750
13,100 miles, and counting
spline lube
Bridgestone S11 100/90
Shinko 170/80
rear end oil change
aftermarket mirrors
windshield
otherwise all stock
*anticipated mods*
Engine Guard
1986vn750 is offline  
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