MotoBatt MBTX14AU in a MK3 ?

VintageMech · Thursday at 6:35 PM

Has anybody using a MotoBatt MBTX14AU AGM battery in a MK3 electric start? If so, how is the battery tray fit, and ability to power a stock, but properly operating, starter?

Lots of new AGM battery choices out there.... Any other battery suggestions that are playing nice in an Electric Start???
Cheers, Jeff

Torontonian · Thursday at 8:12 PM

Well , I can't recommend the Motomaster Eliminator AGM EtX15 much .. died after 15 months . Bought another one , as I have no access to better batteries . Vibration kills Lead -acid batteries . Norton . The MK 111 needs cranking Amps .
I'd like to make a support pad full of springs , for the next season . My new J.S. engine , long rods , short pistons , will have less vibrations . Fire it up in 3 days for the first time . After the trout fishing day tomorrow , of course . In an S.U.V.
Enjoy .

worntorn · Thursday at 8:29 PM

Torontonian said:
Well , I can't recommend the Motomaster Eliminator AGM EtX15 much .. died after 15 months . Bought another one , as I have no access to better batteries . Vibration kills Lead -acid batteries . Norton . The MK 111 needs cranking Amps .
I'd like to make a support pad full of springs , for the next season . My new J.S. engine , long rods , short pistons , will have less vibrations . Fire it up in 3 days for the first time . After the trout fishing 22ndday tomorrow , of course . In an S.U.V.
Enjoy .

I don't understand, the battery should not be vibrating much on any Commando. The engine, yes but not the battery or anything else on the bike other than the engine/trans. The isos should take care of that battery and everything around it.

Glen

Torontonian · Thursday at 10:37 PM

worntorn said:
I don't understand, the battery should not be vibrating much on any Commando. The engine, yes but not the battery or anything else on the bike other than the engine/trans. The isos should take care of that battery and everything around it.

Glen

Oh , there's vibrations everywhere . Felt through handlegrips , footpegs , rev. up the bike and watch the tail light hop .

Desmopower · Thursday at 11:19 PM

VintageMech said:
Has anybody using a MotoBatt MBTX14AU AGM battery in a MK3 electric start? If so, how is the battery tray fit, and ability to power a stock, but properly operating, starter?

Lots of new AGM battery choices out there.... Any other battery suggestions that are playing nice in an Electric Start???
Cheers, Jeff

I have just replaced the very battery in my MK3, it was 9 years old and fitted the battery tray rubber mat perfectly dimension wise. The only thing I didn't like about the MotoBatt is the cheesy battery terminal connections & yellow colour but it did spin up the bike easily.
I have purchased Super Start Battery with a 310 CCA spec but the same dimension size as the MotoBatt to give that brand a try.

cliffa · 2026-05-29T06:11:15-0600

VintageMech said:
Has anybody using a MotoBatt MBTX14AU AGM battery in a MK3 electric start? If so, how is the battery tray fit, and ability to power a stock, but properly operating, starter?

Lots of new AGM battery choices out there.... Any other battery suggestions that are playing nice in an Electric Start???
Cheers, Jeff

If you are also considering Lithium batteries, I can thoroughly recommend NOCO products. I have their NLP 14 in my 961 and it spins it over with gusto. They come with great terminal choices, and a range of spacers to suit different applications.

VintageMech · 2026-05-29T10:55:50-0600

Desmopower said:
I have purchased Super Start Battery with a 310 CCA spec but the same dimension size as the MotoBatt to give that brand a try.

Thanks, yeah the yellow is bold! What is the Super Start Battery part number that has the same dimensions?

Desmopower · 2026-05-29T14:27:39-0600

Have a look in Jimbos thread, I posted a link to the Super Start battery I purchased.

Looking for a list of the most powerful non lithium sized YTX14AH motorcycle batteries

worntorn · 2026-05-29T14:48:39-0600

Torontonian said:
Oh , there's vibrations everywhere . Felt through handlegrips , footpegs , rev. up the bike and watch the tail light hop .

Something seems wrong/unhappy with the isos there. I have the 850 and the 920. Both go smooth as glass over 3000 rpm. Mirrors are clear at 70 mph. Yes there are vibes at low rpm so I don't do much low rpm.
The batteries on the 850 have lasted for a reasonable length of time, 6 years for the last Yuasa. The biggest problem I have with batteries is if I forget to trickle charge the battery once or twice during winter storage. These little batteries won't forgive that. One pull down to under 10 v and they are done.

Glen

Leonc · 2026-05-29T15:16:30-0600

VintageMech said:
Has anybody using a MotoBatt MBTX14AU AGM battery in a MK3 electric start? If so, how is the battery tray fit, and ability to power a stock, but properly operating, starter?

Lots of new AGM battery choices out there.... Any other battery suggestions that are playing nice in an Electric Start???
Cheers, Jeff

I have used two of them over the years, got 7 years out of my last one.
A good fit and spins well, but I do have a Dyno Dave starter in mine.

Desmopower · 2026-05-29T16:59:24-0600

Leonc said:
I have used two of them over the years, got 7 years out of my last one.
A good fit and spins well, but I do have a Dyno Dave starter in mine.

Dyno Dave starter on mine as well - I had a good run out of the MotoBatt on the MK3, probably the best I have ever had out of any brand but I have had not so good runs with other MotoBatts.
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possm · 2026-05-29T18:55:27-0600

BS Battery BTX20CH here same dimensions as a YTX20CHBS, been in for 2 years no problems std starter with 4 brush conversion

MotoBatt MBTX14AU in a MK3 ?

Looking for a list of the most powerful non lithium sized YTX14AH motorcycle batteries​

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