Concrete and battery

[imdying]

Empirical evidence would suggest otherwise, but you can look after your battery any way you see fit. I fixed the problem by fitting batteries that don't discharge themselves.

[notme]

Empirical evidence would suggest otherwise

The suggestion is correct, the misinterpretation that concrete has anything to do with it is where the flaw lies.

but you can look after your battery any way you see fit.

Thanks for that - I will continue my current practices of looking after batteries based on science, not witchcraft, voodo, superstition, or old wive's tales

I fixed the problem by fitting batteries that don't discharge themselves.

I'm guessing LiFePO4 .... which do self discharge, its just very low (like 1.5%/month). Lead Acid's are shitters for self discharge - it can be up to 40% loss from full charge in 3 weeks!

[Flip]

Sounds like a load of rubbish to me.

Given the surface ground temperature is an average of the day and night temps I fail so see any correlation between being on a concrete floor or not. Sounds like folk don't understand the difference between temperature and thermal conductivity.

[TimeOut]

It does - and that reason is that the typical automotive SLI battery performs worse as the temperature drops. This is realted to the self discharge rate - the same mechanism that slow the self discharge when cold is what's responsible for the battery being able to deliver less start current on a cold morning.

Coupled with colder / thicker oil (harder to turn over) is why a lot of batteries fail at the start of winter

[notme]

Coupled with colder / thicker oil (harder to turn over) is why a lot of batteries fail at the start of winter

Good point - and there's also the petrol issues with temperature (evaporates more slowly which is why start ya bastard and other ether products work for cold weather starts) and what's starting to happen nowadays as ethanol is added to fuel, is that there are problems in very cold places where fuel lines are freezing and breaking because the ethanol traps water out of the fuel.

But yeah - with reference to the batteries, it's simply that lead acid SLI batteries will deliver less start current when thier little toes are cold.

[Max Preload]

It does - and that reason is that the typical automotive SLI battery performs worse as the temperature drops. This is realted to the self discharge rate - the same mechanism that slow the self discharge when cold is what's responsible for the battery being able to deliver less start current on a cold morning.

It's not that there's an absence of capacity due to self-discharge that causes a cold battery to not be able to supply its stated delivery current - it's the fact that in the cold the chemical reaction that occurs does so at a much lower rate which compounds the already reduced (due to age) capacity the battery has.

[notme]

It's not that there's an absence of capacity due to self-discharge that causes a cold battery to not be able to supply its stated delivery current - it's the fact that in the cold the chemical reaction that occurs does so at a much lower rate which compounds the already reduced (due to age) capacity the battery has.

Correct - "the same mechanism that slows the self discharge when cold is what's responsible for the battery being able to deliver less start current on a cold morning. "

[F5 Dave]

So why was the battery taken out of the bike to get stored on the floor, concrete or otherwise?

Answer= because it was fuked.

Given an optimistic charge over night & gee it looks fine now, reads alright open cct.. Oh dear it's kuzed.


Bloody concrete. Maybe I should shag-pile.

But that might hurt & if anyone caught me. . .

[schrodingers cat]

They go flat because the mice hook their disco lights up to it having mad bastard raves night after night.

This is a fact. I researched it on the internet.

http://media.tumblr.com/tumblr_levuajxq7W1qb5qpk.jpg

[Bonez]

So why was the battery taken out of the bike to get stored on the floor, concrete or otherwise?

Answer= because it was fuked.

Untrue. It could be removed because the bike is stuffed.