Motorbike jumpstart battery pack

[InsolentMinx]

2wheelsjimmy said:

Was the battery reading 12.5V before you tried to start? Should start no issue off that voltage.

Remember if you buy a new battery, you need to give it a full charge before you put it into the bike and get using it.

Yeah, 12.49 before turning the ignition on.
Drops to 10.9 once ignition on.
But won't turn over, and just clicks. Drops to 9.5 while trying to start


The bonus of this Motobatt battery I currently have is that they say you don't need to charge it before use. It's just plug and play.

"MotoBatt being a premium Absorbed Glass Mat battery is superior by design. AGM batteries have been used in demanding military and off -road applications for many years. The sealed, glass mat design has many longevity and reliability based benefits.
Each plate in the battery is wrapped in a fiberous glass matting which not only absorbs all liquid electrolyte but keeps the plates separated in a cushioned environment. This stops the plates from vibrating which can breakdown the plate and cause short circuits between the plates or break plate welds which result in battery failure. The thick, heavy plates used in MotoBatt designs really make the difference here.
AGM batteries also have a much lower inherent self discharge rate than wet flooded types. And, as a higher amp hour AGM battery, the MotoBatt battery can also discharge more deeply and recover repeatedly under vehicle alternator charge or through maintenance charging. A standard flooded cell battery is not capable of withstanding this type of cycling, without pre-mature failure.
Your Motobatt is a Factory Activated battery. It comes to you pre-conditioned and fully charged for optimum performance and ready to install out of the box. 80% of early PowerSports battery failure is caused by faulty activation of the dry battery plates. Additionally, you never have to mess with acid or top up fluid levels or remove corrosion from the terminals caused by gassing; common with standard flooded battery types."

[2wheelsjimmy]

Something's wrong then.
If it starts fine of a jump battery then I'd suggest the current battery is fked, as the starter is clearly working. It should be fine at 12.5V but if it won't start then it's done. It clearly can't provide the cranking amps needed.
But a new battery, should start fine then.

[Biker 1]

Perhaps the OP could try using a mate's battery? Or something of a similar capacity. If it works, then battery needs replacing. Try ruling out things one at a time, before lashing out £££££ on unnecessary parts.

[InsolentMinx]

Biker 1 said:

Perhaps the OP could try using a mate's battery? Or something of a similar capacity. If it works, then battery needs replacing. Try ruling out things one at a time, before lashing out £££££ on unnecessary parts.

Another super-sensible suggestion!
You lot are very sympathetic towards my bank account, thank you!

My Dad's got a VFR and a Tiger, so will have him take the battery out of one for me to test

[2wheelsjimmy]

InsolentMinx said:

Another super-sensible suggestion!
You lot are very sympathetic towards my bank account, thank you!

My Dad's got a VFR and a Tiger, so will have him take the battery out of one for me to test

Different bikes do need different batteries so check it's compatible first.

The fact a battery pack started the bike; for me makes the conclusion that the bike is fine, but the battery is dead.
It's the same process as using another battery to start the bike, so really, something you've already done.

[InsolentMinx]

2wheelsjimmy said:

The fact a battery pack started the bike; for me makes the conclusion that the bike is fine, but the battery is dead.
It's the same process as using another battery to start the bike, so really, something you've already done.

I thought this too... so I went and ordered a replacement battery yesterday.
Going to whack it on charge tonight (although it says on the box that no initial charging is required), and then hook it up tomorrow or Saturday.

I'll be keeping this one on the battery tender 24/7 now, considering I don't get to ride as often as I'd like.


I still might buy a jumpstart thing, just in case though; they look pretty nifty.

Thanks for your help and wise words

[Prof Prolapse]

I have one of these; https://www.machinemart.co.uk/p/jump-start-900/?da...

Machinemart do 20% discounts a few times a years, so subscribe and then buy one. 900/400 Amp (that's most big cars including my 3.0 v6) in a reliable shell is pretty good for £55, and somewhere that takes returns quibble free.

They're great for investigating any charging issues, the amount of times people come on here and don't know if their battery is knackered which could be tested in most instances with a jump start pack...

[Prof Prolapse]

anonymous said:

[redacted]

fk's sake that's happened to me loads recently. Apologies.

I would argue though that there's no need at all to carry a charging pack, if your bike can't hold charge it needs to fixed.

I agree, unless he's cranking the st out of it before it starts the battery is fked.

[InsolentMinx]

Thanks Prof & Toxic!

Yeah, I think I've come to the conclusion the battery's knackered.

That MachineMart jumpstart kit looks nice and robust, but I was looking for something that could fit under my tiny rear pillion seat- in case I'm away from a tender and for some reason it won't start.
I don't think I'll have a need for a jumpstart pack now that I've got a new battery. But the red blooded male in me likes the idea of a new toy that I may need to rely on at some point (but will probably just sit gathering dust).



Big car service coming up too, so could do with saving the pennies...