M/F AGM vs Lead Acid? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 21 (permalink) Old 06-29-2009, 11:02 PM Thread Starter
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M/F AGM vs Lead Acid?

Recently spoke with a local dealer about how much a stator replacement would cost. Service guy asked what the trouble was and I told him of the stair measurements I had taken, etc., adn he said they sounded low but within normal range. He asked what type of battery I had and told him a M/F AGM and he said it might be part of the problem. He suggested that before I put the $$$ into a stator replacement, might try a new Lead Acid as they require less voltage to charge than a M/F. He said M/F's probably work fine with a new stator pushing 14-15Vdc but need that to "activate" the chemicals to allow charging. Since Lead Acid batteries do fine on high 12.5-13.5Vdc (mine runs around 13-13.2Vdc at 4K rpm) it should be enough to keep the battery charged up.

What do you guys think?

'89 Vulcan 750

VROC# 30232

HID Headlamp Conversion
V&H Cruzers (great sound)
Kaw V-Force Windshield
Kaw Rear Luggage Rack
Kaw Engine Guard
VN750.COM Grill Cover
W&M Black Magic Saddlebags
Diehard M/F Battery
R/R Replaced/Relocated
Stator Replaced
Voltmeter Installed
Splines Lubed
Metzler 880 Marathons
Front - 110/90-19
Rear - 170/80-15
Carbs Balanced
Carb Mix Adjusted
Fuel Tank Derusted/Lined/Sealed
NGK Iridium Plugs
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post #2 of 21 (permalink) Old 06-29-2009, 11:08 PM
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Sounds like more blablablablabla from the dealers to me!!!!

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post #3 of 21 (permalink) Old 06-29-2009, 11:31 PM
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This dealer guy is full of you know what. Go somewhere else.

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post #4 of 21 (permalink) Old 06-30-2009, 12:32 AM
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I did a lot of research using this site and others before investing in a M/F AGM battery. M/F AGM is the way to go.

If your system can't keep it charged, then the system, faulty battery or system load is at fault and needs to be corrected.


Chris Glennon - Portland, OR
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post #5 of 21 (permalink) Old 06-30-2009, 10:04 PM Thread Starter
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Understand, and I'm with you but I was encouraged that at least he was turning away business in a stator replacement and suggesting I try a $50 fix rather than give him $600. Don't often find that at a dealer....

'89 Vulcan 750

VROC# 30232

HID Headlamp Conversion
V&H Cruzers (great sound)
Kaw V-Force Windshield
Kaw Rear Luggage Rack
Kaw Engine Guard
VN750.COM Grill Cover
W&M Black Magic Saddlebags
Diehard M/F Battery
R/R Replaced/Relocated
Stator Replaced
Voltmeter Installed
Splines Lubed
Metzler 880 Marathons
Front - 110/90-19
Rear - 170/80-15
Carbs Balanced
Carb Mix Adjusted
Fuel Tank Derusted/Lined/Sealed
NGK Iridium Plugs
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post #6 of 21 (permalink) Old 06-30-2009, 10:11 PM
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Or, sell you a $50 battery you don't need and then do the stator replacement!

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
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Currently 23,298 miles

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post #7 of 21 (permalink) Old 06-30-2009, 10:28 PM
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It sounds to me like the dealers service guy doesn`t know as much about MF-AGM batteries and the somewhat anemic charging systems that many (most?) bikes suffer from.

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
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post #8 of 21 (permalink) Old 06-30-2009, 10:34 PM
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MF batteries will charge at anything over 12.8 volts. Usualy 13.5 volts is considered the normal charging voltage, but if you are getting 13.0 you are in fact charging the battery. Due note that riding very short distances may be insufficaint to fully charge, but using a trickle charger can solve that when not riding.

I would instead check all your connections and clean them off to make sure you are not losing any voltage due to a bad connection. If you are in fact getting 13 volts at 4000 rpms it would seem to me that your stator is working fine but you might want to check your R/R as this is what converts the stators output to DC volts to charge the battery.


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post #9 of 21 (permalink) Old 06-30-2009, 11:48 PM
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Quote:
Originally Posted by rsawyer View Post
Recently spoke with a local dealer about how much a stator replacement would cost. Service guy asked what the trouble was and I told him of the stair measurements I had taken, etc., adn he said they sounded low but within normal range. He asked what type of battery I had and told him a M/F AGM and he said it might be part of the problem. He suggested that before I put the $$$ into a stator replacement, might try a new Lead Acid as they require less voltage to charge than a M/F. He said M/F's probably work fine with a new stator pushing 14-15Vdc but need that to "activate" the chemicals to allow charging. Since Lead Acid batteries do fine on high 12.5-13.5Vdc (mine runs around 13-13.2Vdc at 4K rpm) it should be enough to keep the battery charged up.

What do you guys think?
Your problem has been highlited!!!!!!

My stator and R/R is 25 years old and I have a Brand New Deka MF/AGM Battery!!!!

Still pushing 14.5V!!!


85 VN700 "Old Yella"

REBUILT ENGINE
CUSTOM PAINT
VANCE & HINES CRUZERS
EAR SHAVED AND RE-JETTED W/K&N'S
DUNLOP ELITE K591 FRONT & REAR
VOLTMETER
SYNTHETIC BRAKE FLUID
SYNTHETIC OIL & GEAR LUBE
PLEXISTAR 2 WINDSHIELD
SPLINES LUBED
ACCT'S GREASED W/TOC SPRINGS
COASTERD
LEATHER SADDLE BAGS
LEATHER TOOL AND ROLL BAG
PICKUP COILS GAPPED AT .018"
NGK CAP, WIRES, IRIDUMS
BARNETT FRICTION PLATES & SPRINGS
CUSTOM GRIPS, MIRRORS, LEVERS
ORIGINAL STATOR & R/R 14.5v
DEKA MF AGM ETX15L

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Last edited by lance328; 06-30-2009 at 11:52 PM.
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post #10 of 21 (permalink) Old 07-01-2009, 11:18 AM
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All MF AGM batteries are lead/acid. The difference between the two is the AGM has the acid absorbed in glass matt like water in a paper towel instead of flooding the battery with acid.

MF AGM batteries do not need a higher voltage to charge, if your system will charge a wet cell battery it will charge a MF AGM battery.

Wet cell batteries will drain their charge faster than an AGM when not in use and an AGM will store more energy when in use.

Wet cell batteries are generaly good for 1-2 years, an AGM is good for 3-6 years.


85 VN700 "Old Yella"

REBUILT ENGINE
CUSTOM PAINT
VANCE & HINES CRUZERS
EAR SHAVED AND RE-JETTED W/K&N'S
DUNLOP ELITE K591 FRONT & REAR
VOLTMETER
SYNTHETIC BRAKE FLUID
SYNTHETIC OIL & GEAR LUBE
PLEXISTAR 2 WINDSHIELD
SPLINES LUBED
ACCT'S GREASED W/TOC SPRINGS
COASTERD
LEATHER SADDLE BAGS
LEATHER TOOL AND ROLL BAG
PICKUP COILS GAPPED AT .018"
NGK CAP, WIRES, IRIDUMS
BARNETT FRICTION PLATES & SPRINGS
CUSTOM GRIPS, MIRRORS, LEVERS
ORIGINAL STATOR & R/R 14.5v
DEKA MF AGM ETX15L

Best Auto/Moto Insurance | Motorcycle Protection Today | FREE Trade-In Quote
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