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SORN
by OldSkrote - 31/07/25 02:07 PM
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New
by Rex_tulips - 30/07/25 07:59 PM
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Forums34
Topics48,368
Posts813,421
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Most Online1,046
Aug 24th, 2023
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Joined: Sep 2014
Posts: 181 Likes: 5
L - Learner Plates On
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L - Learner Plates On
Joined: Sep 2014
Posts: 181 Likes: 5 |
Not sure where you are in Gloucs but these guys have been great to deal in the past: https://www.grovesbatteries.co.uk/
Mike H
Bourgogne Franche Comté
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Joined: Jan 2017
Posts: 637
Talk Morgan Regular
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Talk Morgan Regular
Joined: Jan 2017
Posts: 637 |
I have used as an alternative the AGM-12 Exide Motorcycle Battery 12V (4990). Definitely better than the Banner but exactly the same size.
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Joined: Aug 2019
Posts: 945 Likes: 16
Talk Morgan Regular
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Talk Morgan Regular
Joined: Aug 2019
Posts: 945 Likes: 16 |
As others already said here, I would suggest checking first the earth connections. If your engine started correctly a couple of times, well, maybe you emptied the battery or maybe an earth nut went loose... The sound of the thread you indicated was exactly what my brand new M3W did to me the very first trip / day out. Came back to the garage on an insurance trailer, to just tight a silly nut at the dealer’s garage to restart the engine as if nothing happened. This is the nut that got loose and let us down in the silliest way... It's on the left side of my LHD 3-Wheeler, at the front. ![[Linked Image]](https://www.tm-img.com/images/2020/06/08/Earth-screw-1.png) ![[Linked Image]](https://www.tm-img.com/images/2020/06/08/Earth-screw-2.png)
Last edited by Marmota; 18/01/21 08:42 PM.
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Joined: Sep 2019
Posts: 284 Likes: 21
Learner Plates Off!
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Learner Plates Off!
Joined: Sep 2019
Posts: 284 Likes: 21 |
First Banner failed 1 month after buying car - KH gave me a new Banner (which had the pos/neg posts in opposite position???) - this failed 6 months later. Now use this: https://www.demon-tweeks.com/eu/odyssey-extreme-racing-25-battery-pc680-odypc680/ Smaller/lighter than Banner, so had to fit a plywood base to battery tray frame and modify top clamp. Starts immediately.
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Joined: May 2010
Posts: 9,285 Likes: 69
Needs to Get Out More!
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Needs to Get Out More!
Joined: May 2010
Posts: 9,285 Likes: 69 |
I have an Odyssey on my Plus8 at least 8 years old ( it was on the car when bought) and still starting the car easily.
Ctech keeps it managed using direct to battery connectors that came with the Ctech.
I did once drain the battery by leaving lights on whilst garaged but it recharged ok with the Ctech.
Last edited by sospan; 19/01/21 11:08 AM.
Plus Four MY23 Furka Rouge
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Joined: May 2015
Posts: 1,774 Likes: 19
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: May 2015
Posts: 1,774 Likes: 19 |
I have an Odyssey on my Plus8 at least 8 years old ( it was on the car when bought) and still starting the car easily.
Ctech keeps it managed using direct to battery connectors that came with the Ctech.
I did once drain the battery by leaving lights on whilst garaged but it recharged ok with the Ctech. I dont think full car batteries in the Trads have the same issues as the bike batteries in M3Ws. I went Lithium. Anyone need a Pb battery conditioner? 
M3W5sp 2015, MSCC, MTWC, Oxon UK
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Joined: Feb 2019
Posts: 1,876 Likes: 15
Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Feb 2019
Posts: 1,876 Likes: 15 |
the problem for MC batteries is that the way they reduce the size is to use thinner plates. They are more likely to warp and just get "used up" quicker. We have a plus 8 with an Odyessy which is still a VERY small battery for an 8 cylinder engine.
Rodger
2018 M3W "Dreamers on the Rise"
2004 Plus 8 (wife's)
old Goldwings and a couple of Harleys
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Joined: Apr 2014
Posts: 697
Talk Morgan Regular
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OP
Talk Morgan Regular
Joined: Apr 2014
Posts: 697 |
Thanks again, everyone for help and comments. I started the car easily tonight, and will get it home on Friday to give everything a check over, and then MOT. Would have tonight, but it was torrential rain and I chickened out! 
Rob
Bavaria 46, 20% of Hunter Impala. 100% of another Hunter Impala, black 4/4 Competition
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Joined: Jul 2014
Posts: 92
Just Getting Started
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Just Getting Started
Joined: Jul 2014
Posts: 92 |
Sounds like you got the problem resolved. Great news!
For the record, EarthX’s lithium ETX36D has proven a very reliable replacement to the Banner, even with the immobiliser energy drain.
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Joined: Jun 2015
Posts: 572 Likes: 2
Talk Morgan Regular
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Talk Morgan Regular
Joined: Jun 2015
Posts: 572 Likes: 2 |
Apparently the battery in my M3W (a Yuasa - same size as original Banner) has died again while it is in storage in France. I suspect that the CTEK conditioner that I left in the car, did not get connected as instructed. I will now consider going lithium. I have a solid state H-D rectifier/charge controller, which apparently works well with Lithium batteries. As I cannot currently access the car, can someone please advise me the dimensions of the original battery. Selection of Lithium batteries is quite limited in France, with most being send mail order from Germany, so as and when permitted, I may need to take one out with me. One reason for going lithium is that charging a lead acid battery in ambient temperatures of 45ºC and probably 55-60º or more under the bonnet, apparently shortens their life considerably.
Wilson
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