---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Mon 09/14/15: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 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 _____________________________________ Time: 05:55:51 PM PST US Subject: AeroElectric-List: Radio battery voltage? From: Ron Burnett 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 _____________________________________ Time: 07:03:31 PM PST US Subject: Re: AeroElectric-List: Radio battery voltage? From: Charlie England 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 _____________________________________ Time: 07:30:49 PM PST US Subject: AeroElectric-List: Re: Radio battery voltage? From: "user9253" 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 _____________________________________ Time: 09:16:32 PM PST US From: "Jim Kale" Subject: RE: AeroElectric-List: 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.