[time-nuts] Battery backup of frequency standards

Brooke Clarke brooke at pacific.net
Thu Jun 9 10:48:28 EDT 2005

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.

Have Fun,

Brooke Clarke, N6GCE

w/Java http://www.PRC68.com
w/o Java http://www.pacificsites.com/~brooke/PRC68COM.shtml

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