[time-nuts] Battery backup of frequency standards
brooke at pacific.net
Thu Jun 9 15:48:31 EDT 2005
I don't think it's possible with a BA-5590. There's circuitry inside
that limits the current draw with a dead short. Fully draining the
battery is no problem, in fact there's a one way action switch on the
BA-5590/U that puts a resistor across each internal battery in order to
fully drain it.
You may be thinking about Li-Ion or Li-poly batteries where fire comes
out of the battery when it's mistreated (too much current either charge
or discharge, over or under voltage, or mechanical puncture). Like the
video at: http://www.valence.com/SafetyVideo.asp
Not true about LiSO2 batteries and commercial products. The "D" cell
that's inside the BA-5590 is used in a number of products, medical
emergency equipment and head mounted flashlights come to mind.
Brooke Clarke, N6GCE
Chuck Harris wrote:
> Brooke Clarke wrote:
>> Hi David:
>> You might consider getting a BA-5590/U military battery, see:
>> These are really two seperate batteries, each one made up of 5 LiSO2
>> cells, 15 volts per battery, 30 volts if connected in series.
>> These are primary (not rechargeable) batteries with a shelf life well
>> in excess of 10 years. (I have some 14 year old units that test at
>> 100%) Between 170 and 210 Watt hours depending on which manufacturer
>> and date you get. You need to be extremely careful NOT to charge them.
> You must also be extremely careful NOT to fully discharge, or short
> circuit them. If you do, explosion, or explosive outgassing of Hydrogen
> gas is a very real failure mode.
> There are very good reasons why LiSO2 batteries are never used in
> or consumer equipment.
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