78 400T- a battery closer to original physical size?
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Thread: 78 400T- a battery closer to original physical size?

  1. #1
    Senior Member Oldschooldropout's Avatar
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    78 400T- a battery closer to original physical size?

    I know it's been a while since my last post, and I apologize. But, in a way, that's a GOOD thing! It means the bike is running quite well, and anything that has come up is easy enough to remedy on my own.
    But it's come time to get a new battery again, and I'd like to TRY and find one that is closer to the original physical size of the original one without compromising the generating system. As you may know, the recommended battery replacement is model no. (12N9-4B-1), which is quite small physically compared to the original. The rubber hold-down strap is rendered completely useless, and with my recently discovered OCD, I find that it simply 'bugs' me! I'd like to 'knock this bugger off my list' (if I can).

    My question is: Has anyone found a battery anywhere that is closer to the original physical size without causing charging problems? That is, without a dubious 'rebuilt' one, of course.

    Thank you in advance for considering my problem...
    Steve
    78 CB400TII

    "So many mistakes to make, So little time"

  2. #2
    Senior Member dtsmjr8dan's Avatar
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    I think the CB 400 takes the same battery as the CM 400. Physical size 5.3" L x 3.1" W x 6.3" H. A 12A-A. Jim should know for sure as he has both a 78 CB and a CM, but he swears by motobatt MB12-U.
    J-T and ctrider like this.
    1979 CM400T (rider),
    1981 CM400T (in surgery receiving transplant)
    1982 CM450 (parts bike)
    1982 CB450 (parts bike)
    Past rides: Vincents, Triumph, BSA's, Suzuki's, Twingle, Corgy, others.
    Remember, today is the tomorrow we worried about yesterday.
    My chest fell, but, fortunately, my belt caught it.
    I don't know everything, nor, have I met the one who does.

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  3. #3
    Super Moderator longdistancerider's Avatar
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    The CB400 batteries are a bit smaller than the CM's. The 12N9-4B-1 battery translates to this MotoBatt MB9U
    Using the MotoBatt selection tool it calls for the MB12U which has 160 CCA vs. 140 CCa for the MB9 but both are higher than the 85-90 CCA for the lead acid 12N9-4B
    Yuasa calls for a YB12A-A which also translates to the MB12U.
    So if you go the MotoBatt route you want the MB12U
    BTW: welcome back
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration

    SALE IS ACTIVE TILL 200 SHIRTS SOLD T-shirt sales supporting 66Sprint's Land Speed Record Build http://www.hondatwins.net/forums/22-...d-attempt.html

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  5. #4
    Senior Member Oldschooldropout's Avatar
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    WOW! Thank you very much guys! I'll get on it right away. I've always wanted a few more CCA, as this bike is kinda hard to start in colder weather. (thank the maker for the 'kickstarter')
    BTW...Happy New Year to you all!
    Thanks again,
    Steve
    78 CB400TII

    "So many mistakes to make, So little time"

  6. #5
    Super Moderator longdistancerider's Avatar
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    Just pulled the batteries out of the bikes for winter storage on trickle chargers. The MB12U will fit the CB400T2, my T1 uses the MB9U and it is way smaller than the 12
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration

    SALE IS ACTIVE TILL 200 SHIRTS SOLD T-shirt sales supporting 66Sprint's Land Speed Record Build http://www.hondatwins.net/forums/22-...d-attempt.html

    http://www.hondatwins.net/forums/22-...d-attempt.html and http://www.hondatwins.net/forums/1-p...r-attempt.html
    Road Trip http://www.hondatwins.net/forums/11-...here-i-go.html or "where's Jim now?"
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  7. #6
    Senior Member Oldschooldropout's Avatar
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    I ordered the MotoBatt MB12U on EBay which was quite convenient since my debit card was fried, and they took 'PayPal'. I paid about 90 bucks all told. At this time I'm quite happy about the purchase. The battery arrived about four days later, fully charged, and packed professionally.
    It's been a bit cold here, but I finally got the chance to install it yesterday and try it today. WOW! That's all I've got to say. What a difference those extra CCAs make! It was hovering around 40F when I had to go to the store, and what would have taken about 6 kicks to start him, was just a few cranks more than normal. I never had to put a charger to it. The battery was just perfect.
    Thanx gentlemen, I am quite the 'happy camper'

    Steve
    ctrider likes this.
    78 CB400TII

    "So many mistakes to make, So little time"

  8. #7
    Senior Member Oldschooldropout's Avatar
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    I forgot to add.....I wanted a bigger battery, and that's what I got. So it was somewhat of a chore to install. But with some patience, and some 'warm-up' breaks, the versatile connections design of the MotoBatt made it do-able.
    It fits nicely in the battery box.

    Steve
    longdistancerider likes this.
    78 CB400TII

    "So many mistakes to make, So little time"

  9. #8
    Super Moderator longdistancerider's Avatar
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    It's a snug fit but you'll be happy you went this route
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration

    SALE IS ACTIVE TILL 200 SHIRTS SOLD T-shirt sales supporting 66Sprint's Land Speed Record Build http://www.hondatwins.net/forums/22-...d-attempt.html

    http://www.hondatwins.net/forums/22-...d-attempt.html and http://www.hondatwins.net/forums/1-p...r-attempt.html
    Road Trip http://www.hondatwins.net/forums/11-...here-i-go.html or "where's Jim now?"
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  10. #9
    Senior Member Oldschooldropout's Avatar
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    You are quite right Jim.
    It's only been 3 months since I installed this battery, but I am one happy biker!
    I've got 'oodles' of power, in ANY temperature, and there is no strain whatsoever on the alternator!
    I can see why you recommended this. Thank you very much!
    Steve
    78 CB400TII

    "So many mistakes to make, So little time"

  11. #10
    Senior Member dtsmjr8dan's Avatar
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    I also vote for the MB12U. I've been using mine for a couple of months as well and it seems to have more on tap than the last regular lead-acid I had in it.
    Thanks for your input, Jim.
    1979 CM400T (rider),
    1981 CM400T (in surgery receiving transplant)
    1982 CM450 (parts bike)
    1982 CB450 (parts bike)
    Past rides: Vincents, Triumph, BSA's, Suzuki's, Twingle, Corgy, others.
    Remember, today is the tomorrow we worried about yesterday.
    My chest fell, but, fortunately, my belt caught it.
    I don't know everything, nor, have I met the one who does.

    T-shirt sales supporting 66Sprint's LSR Build http://www.hondatwins.net/forums/22-...d-attempt.html

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