Today's Message Index:
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1. 05:55 PM - Radio battery voltage? (Ron Burnett)
2. 07:03 PM - Re: Radio battery voltage? (Charlie England)
3. 07:30 PM - Re: Radio battery voltage? (user9253)
4. 09:16 PM - Re: Re: Radio battery voltage? (Jim Kale)
Message 1
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| Subject: | Radio battery voltage? |
I have a Luscombe and use an ICOM radio/VOR on a Quantum rechargeable battery.
On the radio I also use a 10 cell AA attached battery which measures 16 volts
with new cells in it.
My question is does this high battery voltage "trump" my 12.6 rechargeable? It
seems to as my batteries keep needing to be replaced and I rarely need to charge
the rechargeable.
Inquiring minds want to know.
Thanks,
Ron Burnett N1131B Luscombe 8A
N524RB RV-6A
Sent from my iPad
May you have the blessings of the Lord today.
Message 2
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| Subject: | Re: Radio battery voltage? |
On 9/14/2015 7:53 PM, Ron Burnett wrote:
>
> I have a Luscombe and use an ICOM radio/VOR on a Quantum rechargeable battery.
On the radio I also use a 10 cell AA attached battery which measures 16 volts
with new cells in it.
>
> My question is does this high battery voltage "trump" my 12.6 rechargeable?
It seems to as my batteries keep needing to be replaced and I rarely need to charge
the rechargeable.
>
> Inquiring minds want to know.
>
> Thanks,
>
> Ron Burnett N1131B Luscombe 8A
> N524RB RV-6A
>
Are you saying that you're using an Icom portable, with a 10 cell
internal battery pack, and you're supplying 12V to the same portable
through its external power jack?
If so, then 'it depends'. Some portables will charge the internal pack
from the external power jack; some won't. But 12V won't charge a 16V
battery pack, in any case. Some portables actually disconnect the
internal battery pack when powered off the external power jack.
Why not simply remove the battery pack & run off the 12V battery. If you
lose the battery, reinstall the internal pack.
Message 3
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| Subject: | Re: Radio battery voltage? |
If two power sources are connected to a load, the load will draw all current from
the higher voltage source and draw no current from the lower voltage source.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=447070#447070
Message 4
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| Subject: | Re: Radio battery voltage? |
The explanation below is true, but too simplistic. Most battery devices
have a diode built in so that if a higher voltage is applied, the device
will use power from the higher voltage source, but the diode will prevent
current from flowing into the battery (lower voltage source in this case)
If the battery is rechargeable, there may be a path to charge the battery
while the device is using the higher source. However, with regard to
non-rechargeable batteries, that would be bad news.
Bottom line it all depends on how the device circuitry for using outside
sources, and internal batteries. Let the user beware with regard to
devices where the circuitry is not known.
I once used an ICOM IC A-23 handheld radio. The instructions were unclear
about recharging the rechargeable battery while using the external plug. I
finally experimented at the risk of the handheld smoking. Turned out that
my rechargeable batteries did charge while the radio used the higher
external source voltage, and I did no harm to my handheld. However, the
results may have been much less desirable.
Jim Kale
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of user9253
Sent: Monday, September 14, 2015 9:30 PM
Subject: AeroElectric-List: Re: Radio battery voltage?
If two power sources are connected to a load, the load will draw all current
from the higher voltage source and draw no current from the lower voltage
source.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=447070#447070
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