Gary: How old are your Battery Tenders? The one I purchased, 12 VDC, 1.25 A, "Battery Tender Plus" model 021-0128, June 2023, is too
white-noisy on MF/HF when used on a radio battery to keep it powered while operating.
I have an older 1.5 A Schumacher charger/maintainer (SEM-1562A) on the radio desk battery now. It is much quieter than the newer Battery Tender
but hasn't been getting the job done for a 100 AH Mighty Max AGM battery -- at least now that I put an older ICOM-756 Pro II on it that draws 3
A just sitting there receiving. A newer version of the same alleged Schumacher model was way too noisy on the radio desk, but is OK at the far
end of the house keeping a "portable" (if you have a mule) generator starter battery maintained; clearly the design changed between my two
Schumacher purchases.
The battery itself has probably failed (after 2 years), and once the voltage drops below low 12.x now it keeps crashing quickly down toward
"nothing" with the 3 A load on it. This just began the past week after a few months of operating with no such problems. I'm just not sure yet
whether a 1.5 A C+M cycle helped cause it. I'm not the only one complaining about short Mighty Max AGM life either. Once the voltage drops
down to ~12 I had been just turning off the thirsty ICOM and waiting for it to charge back up.
At the same time, 1.5A is well below the recommended charging current for a 100 AH AGM. So, I'd like to replace it with a 5 A charger, but need
to find a quiet one.
So, I may have two problems feeding off one another to solve here. A big linear supply for routine ICOM use is of course a solution for the
noise, but also complicates the overall configuration.
Tnx.
On 2024-09-13 09:55, Gary Smith wrote:
Batter tender is my favorite brand. Have three on my m/c’s when not riding.
Gary…wa6fgi
Sent from Gary’s iPad
On Sep 12, 2024, at 10:14 PM, David E. Crawford <dcsubs@molniya1.com> wrote:
Any make/model recommendations, based on direct experience, for an RF-quiet
battery charger+maintainer, AGM or flooded deep cycle lead-acid, 12 VDC, 3 to 5 A
rating?
Thanks!
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David E. Crawford
Indian River City
Florida Libre
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David E. Crawford
Indian River City
Florida Libre
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