Which Battery?

& Clyde's got one with the + & - terminals where there suppose to farken be.
,, & Clyde can deal with the extra 500 farken grams.

http://www.batterymart.com.au/dispdet.php?idw=1304011325467739

ay Cam,  here's a question for ya electrical blokes.
why don't ya see any spec stated for amp-hours (Ah) on any lithium battery ??   or am i missing something ??
maybe it's hiding in the part number, i.e.  ---14--- is a 14 Ah ??
Dellortoman said:
,, Or maybe lithium amps are smaller than lead-acid amps.
Click to expand...
 
yea,  i've always regarded the CCA spec as just a bit of hocus-bloody-pocus.
but,, i'm just a mechanical bloke from da cane fields ay.

ay Davo,  i try like to keep things erect.
Davo said:
,, if yours is installed standing up  :-*
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markQLD said:
yea,  i've always regarded the CCA spec as just a bit of hocus-bloody-pocus.
but,, i'm just a mechanical bloke from da cane fields ay.

ay Davo,  i try like to keep things erect.
Click to expand...

The Viagra is in the post, you should be OK any day soon  :D
 
Yes, the old CCA vs amp.hours chestnut.

I remember the days when all battery capacities were amp hours. Which is useful to know if you're using it as a deep-cycle battery, as in an electricvehicle. But it's not particularly relevant if the main purpose is for starting an engine.

For a starting battery, you need a whole lot of amps for a short time, which may not amount to many amp hours. If your starter is pulling 100 A for 10 seconds, that's only about 0.3 Ah. If the battery has a 10 Ah capacity you could in theory crank the starter for 6 minutes.

So CCA is a good indication of a battery's cranking power. The amps a battery can deliver is a function of internal resistance, which is a mainly function of plate surface area and internal conductor size. So bigger batteries deliver more amps, as you'd expect.

The 400 CCA of Davo's battery is probably well in excess of what the starter motor needs, but as batteries get old and tired their performance drops off (a bit like us) so his 400 CCA battery might remain useable for a couple of years after a 200 CCA battery has retired.

Anyway, I reckon I'll try the little 220 CCA battery and see how it goes. If I had an ammeter that would read high enough, I'd measure the current draw of the starter motor. Yeah, I know, I could use a 10A meter with a fucking enormous shunt resistor, but I can't be bothered.

Cam
 
Been looking at this for a while. Lots of suspect information being put out by manufacturers, particularly A/H numbres.
Some excellent testing and commentary here: http://www.advrider.com/forums/showthread.php?p=20684639
Discovered that the actual (?) A/H rating of Lithium Ion batteries is around 1/3 to a 1/4 of the number quoted. So, the SSB LH 12 would be at around 3 or 4 A/H, compared with a lead acid battery. But then, the way the lead acid battery is tested effects the result dramatically......temperature, time c/w discharge rate etc etc......
The other type of battery to consider is the LiFePO4. Appear to have lower cranking amps than the Lithium Ion, but significantly better storage (A/H) ratings, though very particular about charging.
Anyone come across these. ???
Found this lot. Look OK, but expensive: http://www.ballisticparts.com/index.php
Fascinating subject.

Lex.
 
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