Re: [ST] Flat Battery

["Kevin Dicks" <kdicks@xxxxxxxxxx>]

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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