Re: [ST] Flat Battery

[Neil Lindsey <Neil.Lindsey@xxxxxxx>]

Kevin -- 

sorry, but you have no idea what you are talking about

----- Original Message ----- 
From: "Kevin Dicks" <kdicks@xxxxxxxxxx>
To: <ST@xxxxxxxxxxxxxx>
Sent: Wednesday, March 07, 2007 12:14 PM
Subject: Re: [ST] Flat Battery


> Agreed.  What I should have said is that a car battery needs more current 
> to
> charge it compared to a bike battery given the same time period - another
> effect of this is, as you point out, it has a higher AH.  If you leave a
> battery on a 20mA charger for long enough, given the correct voltage, it
> will probably eventually charge (as long as the battery is in good 
> condition
> etc).  The point I was trying to make was that even though a car battery 
> and
> a bike battery have the same voltage, they are very different when it 
> comes
> to current (and therefore the AH each can provide).  Given this 
> difference,
> the charging system of a car can (because it has to) provide far more 
> power
> (Volts *  Current) than a bike charging system can.  Given that,
> jump-starting a bike from a car with the car engine running, 'may' lead to
> problems with the bike due to the higher current the car charging system
> provides.
>
> -----Original Message-----
> From: st-bounces@xxxxxxxxxxxxxxxxxxxx
> [mailto:st-bounces@xxxxxxxxxxxxxxxxxxxx] On Behalf Of Eoin Kirwan
> Sent: Wednesday, March 07, 2007 3:08 PM
> To: ST@xxxxxxxxxxxxxx
> Subject: Re: [ST] Flat Battery
>
>
> On Wednesday 07 March 2007 03:23, Kevin Dicks wrote:
>> Current is not the same as Voltage. Just look at the size of a car's
>> battery in comparison to a bike's.
>
> But it's the same voltage. The larger size means more amp-hours, so it can
> power a given load for a longer time - or a larger load for the same 
> length
> of time - before it becomes discharged.
>
>> The car battery needs more current to
>> charge it - even though the voltage is the same as the bike's (give or
>> take).
>
> It doesn't need more current to charge it, it needs more amp-hours to 
> charge
>
> it. Whether you do that by using a larger charge current in the same time,
> or
> use the same charging current for a longer time, is up to you. The 
> *maximum*
>
> recommended charging current will be larger, but you don't have to charge 
> it
>
> at the maximum rate, it'll just take longer.
>
>
> Eoin
>
> '04 ST955i
>
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