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Re: [ST] Very Sudden Battery Death?



Mike Bostock wrote:

<SNIP>

It's science time!

> Very useful, hence my voltage test under load.
> 
> 
> Time	Load (reading in volts)	
>  0	12	
>  1	11.99	
>  2	11.98	
>  3	11.97	
>  4	11.95	
>  5	11.93	
>  6	11.91	
>  7	11.89	
>  8	11.86	
>  9	11.83	
> 10	11.81	
> 11	11.78	
> 12	11.75	
> 13	11.71	
> 14	11.68	
> 15	11.64	

I thought I'd do something similar tonight before I started the bike up.
Battery was charged at 800mA for 16 hours on Saturday night, bike was 
driven for about an hour on Sunday, then left until this evening.  No 
parking light on.  Honest.

Battery voltage:  12.66
Ignition on:      12.20
Lights on:        12:00
1 minute:         11.92
6 minutes:        11.87
12 minutes:       11.68
Everything off:   12:20
15 minutes later: 12.41

Ignition on, hit the starter, and it turned over quickly a couple of 
times and started easily.

Engine running:   13.70

If it wasn't for my girlfriend having started a new job today, my 
timings/interruptions would have been a bit better/fewer, but I think 
the overall result is conclusive:

I left the parking light on all day on Friday...
Probably.

My battery is a bit past its best...
Definitely.

Thanks for all the replies and support!

Cheers,

Andrew

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