[amsat-bb] Re: Let Your Garage Charge Your Radio
Edward R. Cole
kl7uw at acsalaska.net
Fri Dec 31 10:18:38 PST 2010
Pretty good guess, David. These days newer HT come with
Nickel-Metal-Hydride which do not need the kind of maintenance that
NiCD do. Typically they hold charge much longer and do not develop a
At my former employment (now retired) we maintained over 200 HT
batteries for immediate emergency response. It was sufficient to put
the chargers on a timer to charge them for a couple hours/day (typ.
at night). Batteries that had not been regularly charged held good
for up to 30-days after a full charge cycle.
Important to use chargers designed for the chemistry of the
battery. Back in the day of NiCD we charged once/week and
reconditioned monthly to extend life on batteries that had to perform
but sat on the shelf for long periods of non-use. The absolutely
worse thing one could do was set a HT into a charger full-time.
In a response van we had a large deep-cycle 4D lead-acid battery and
it was charged with the proper float charger. But not being a sealed
battery, one had to check the electrolyte level periodically.
I the comm center an eight-battery bank wired for 48vdc was run on
float and they typ. were good for 4-years of standby use (fed
industrial size UPS). The 12vdc equipment ran on another large 12v
battery bank with float. That equipment was powered 24/7 with
similar life-cycle of several years. Note that commercial deep-cycle
batteries were used and cost 3x what the typ. car battery costs.
Now I have a 6500w standby generator so battery back-up is less
necessary for the home station (I do have a bank of 8AH gell-cell
batteries). No HT, at present.
73, Ed - KL7UW
At 01:25 AM 12/31/2010, G0MRF at aol.com wrote:
>Sounds like a unique solution. Probably OK for NiCd or Lead acid.
>However, if it's any sort of Lithium technology in those batteries, then
>deep cycling and a top up charge is definately the wrong way.
>For maximum shelf life Lithium batteries need to be kept at 40 - 60%
>charge, then topped up when needed. Also, for the maximum number
>of cycles, the
>battery needs a small depth of discharge not deep cycling.
>Your friend is probably using NiCd bats, but I thought I would mention it
>just in case anyone thought this would be a good idea for Lithium batteries.
>Thanks es HNY
>In a message dated 30/12/2010 19:20:52 GMT Standard Time,
>clintbradford at mac.com writes:
>He also performs a "cycling" of his battery pack every 60 days (running
>the radio until it won't power on, then charging).
>After a year-and-a-half of this, his voltage indication is still quite
>high. When he performs his "cycling," the pack seems to not have
>lost a bit of
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73, Ed - KL7UW, WD2XSH/45
BP40IQ 500 KHz - 10-GHz www.kl7uw.com
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