MotoBatt MBTX14AU in a MK3 ?

VintageMech · 2026-05-28T18:35:55-0600

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 · 2026-05-28T20:12:27-0600

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 · 2026-05-28T20:29:05-0600

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 · 2026-05-28T22:37:20-0600

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 · 2026-05-28T23:19:10-0600

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 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.

MotoBatt MBTX14AU in a MK3 ?

VintageMech

Torontonian

worntorn

Torontonian

Desmopower

cliffa

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