Lithium battery?

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andyb
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Lithium battery?

Postby andyb » Sun Sep 10, 2017 6:11 pm

Has anyone fitted a lithium battery to an airhead? Seens like a good way to loose some top end weight, but I don't know if they are compatible with the charging system.
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Tony the Skin
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Re: Lithium battery?

Postby Tony the Skin » Sun Sep 10, 2017 6:23 pm

Considered putting one on mine but UK prices are very high. Spoke to someone yesterday who put one on a Honda but found it poor on cold starting.
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Re: Lithium battery?

Postby barryh » Sun Sep 10, 2017 7:59 pm

Poor performance at low temperatures is an inherent characteristic of lithium batteries. You have to adopt a technique of pre-heating the battery by turning on the headlight for a short time before attempting to start.

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CharlieVictor
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Re: Lithium battery?

Postby CharlieVictor » Sun Sep 10, 2017 8:03 pm

A good maintenance-free AGM such as the Motorbatt or Odissey PC680 does the job just fine for a very decent cost.
IMHO the difference in weight is not worth the difference in price.
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Re: Lithium battery?

Postby Tony the Skin » Sun Sep 10, 2017 8:06 pm

A good maintenance-free AGM such as the Motorbatt or Odissey PC680 does the job just fine for a very decent cost.
IMHO the difference in weight is not worth the difference in price.



Which is where I ended up =D>
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Galactic Greyhound
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Re: Lithium battery?

Postby Galactic Greyhound » Sun Sep 10, 2017 8:23 pm

There have been previous threads on the forum about the use of Lithium batteries on bikes - you might want to do a search for these.

In the meantime, here is a Wikipedia article which is worth reading particularly about the danger and use of re-chargable Lithium Ion batteries.
The charging environment of a Lithium Ion battery requires to be tightly controlled. See the article section on 'Charge and Discharge':
"......Failure to follow current and voltage limitations can result in an explosion......"

Note that a motorcycle battery is subject to higher levels of vibration and shock than a battery in other vehicles and this itself constitutes an added risk to those quoted in the article:

https://en.wikipedia.org/wiki/Lithium-ion_battery

For my own part, I can see no advantage in the use of a lithium Ion battery except for racing where the lighter battery confers a weight advantage and along with the absence/removal of any on-bike charging facilities.
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Re: Lithium battery?

Postby andyb » Mon Sep 11, 2017 3:47 pm

The Shorai equivalent to a lead acid saves 5kg weight, well worth having.
But it needs a 13.1 - 15V charge, which is a bit high for a boxer.
I think the battery can get damaged charging at lower voltages than this?
Price - yes, more than a lead acid, but prices are coming down all the time
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Re: Lithium battery?

Postby barryh » Mon Sep 11, 2017 6:12 pm

I'll bet that these lithium batteries that save 5 KG are not the same Ah rating as the AGM that they are being compared against. They might have the cranking power yes but not the Ah capacity so is it a fair comparison ?

If I was looking for weight reduction I'd take a slightly different approach.

First save some weight and at the same time reduce the demands on the battery by using a geared starter like the Denso. Then use a smaller than stock AGM. Look at the size of battery used in something like a big Ducati. They seem to get by on a 12Ah or 14 Ah AGM battery so why wouldn't an airhead ?


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