Re: Deep cycle battery capacity


"Terry Bull" <wilkinsons.hifi@xxxxxxxxxx> wrote in message
news:42b13460$0$11125$ed2619ec@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Although not a definitive guide and I'm sure someone else will correct
me,
> but
> I use a digital volt meter and measure the (offload) voltage at different
> times to build a rough picture of the voltages you expect when
> full/half/empty etc.
> As mentioned temperature etc will change these but as a rough guide a
full
> battery( in good condition) will read somewhere 14.0 - 14.4v (more when
> 'hot' off the charger)
> When empty the battery would read 12.0- 12.5v say.
> You can then check the voltage/ charge level using the meter ( when no
> current is being used ideally)
> If you put the meter on whilst charging you'll see voltage come up
slowly
> over the hours.
>
> I was told to beware of the type of charger - in order to get the best
life
> from the battery. If you constantly use fast chargers, 1: the life of
the
> battery is shortened, 2: since the cells are pulled up above 14.4v
> 'boiling' occurs thus losing water longterm.
> Its better to have say a 13.8v fixed charger which will charge very slowly
> ( not usually a problem unless you're out every week caravanning~), thus
> effectively trickling the battery upto 85-90% capacity over 3-4 days. This
> type of charger will self limit at that voltage so there's no chance of
> overcharging the battery & you always know where 'full' is.
> Unlike say Nicad batteries which have a memory effect and don't like being
> just topped up anytime, a lead acid type battery requires the charge in
the
> acid to stop the acid attacking/reacting with the plates, so its best to
> fill it up asap when any has been used.
>
> As I said at the top, I'm sure others may disagree with some of this... so
> please feel free to correct me where appropriate..
>
> Andrew
>

As you suspect you are quite a bit off the mark here.
Have a look at any of the SLA battery manufacturers web sites for technical
details.


.

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