Re: Combining battery question.

I do not agree with the reply you were provided by DaveM, although I do
agree with his note of caution if using the batteries in parallel.

Although it is not clear exactly what you mean by "combining" the batteries
(this can be either in Series or Parallel), if the two 12V batteries are
placed in series, then they will produce 24V nominal voltage with no
increase in the maximum current they can supply. If the batteries are
combined in parallel, then the voltage will still be 12V, but the maximum
current they can supply will double.

That said, the ampere rating you provide is most likely not a true maximum
current (in amps as you noted), but is probably a CAPACITY rating for the
battery and if so, would be supplied in amp-hours. For the 12V battery you
cited, a 7AH rating would mean that hypothetically you could supply a
current of 7 amperes for a period of 1 hour. Likewise, if you were
supplying, say 700 milli-amps, then you would expect to be able to do so for
about 10 hours. (This is assuming that the internal resistance of the
battery and its construction/specifications would support these currents for
this period of time - it may be that the maximum spec for current is
substantially less than the 7A I used as an example.) The bottom line here
is that when the batteries are in series, their combined AH rating will not
change. When used in parallel, the AH rating will double. If you do the
math you will see that the energy supplied (in watt-hours, where watt =
volts * amps) is the same as the theory of energy conservation would dictate
must occur.

Bob

"DaveM" <masondg4499@xxxxxxxxxxxxx> wrote in message
news:erSdncFlIsR6Lx_fRVn-rA@xxxxxxxxxxxxxx
> "rutman" <elcid2k@xxxxxxxxxxx> wrote in message
> news:108581hibmk4a5hc676d4plmob0fuveucd@xxxxxxxxxx
> > Hi
> >
> >
> > I have identical batteries. Each are rated at 12v 7amps
> >
> >
> > I would like to know if its possible to combine both batteries to give
> > me 12 volts 14 amps.
> >
> > I am guessing that if I hook them up in parallel it should do the job?
> >
> >
> > please let me know.
> >
> >
>
> Yes, with a note of caution.... The batteries should both be in the same
> condition, i.e., brand new, or having been used in the same type of
service


.

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