[R-390] Batteries

[Raymond Cote]

Ditto the battery references. I also worked in oceanography and purchased my batteries by the pallet loads. I had no trouble with leaks or bad cells. On our case, we tested many cells in 1978 or 1980 time frame and concluded with voltage and current tests that the copper top Duracell was top with energizer a close second. The others listed did not come close. We soldered multiple batteries together to fit in a round pressure case to get the right voltage/current specs we needed. An instrument would be expected to last on the ocean floor up to a year. Our timed releases were also powered with Duracell batteries to fire an explosive bolt. 


Raymond Cote
KD9CCZ



On Nov 15, 2014, at 09:25, Johnsay Johnsay via R-390 <r-390 at mailman.qth.net> wrote:

In my line of work I purchased pallet quantities of alkaline batteries for use in scientific oceanographic equipment.  These instruments (current meters,  thermistor strings and acoustic mooring releases)  were typically deployed for one and occasionally two years in difficult environmental conditions.  Batteries were frequently in storage for a  year or two before use due to the purchase requisition process.  All batteries were load tested before installation.   My preference based on a variety of operational characteristics were  first to last:  Panasonic Industrial,  Energizer,  Duracell, and Rayovac.   Rayovac was well down the list with quite a few more problems with leakage.  
We did a trial with primary lithium batteries but these tended to have more problems with leakage.   When this happened, due to their chemistries they would totally destroy the instruments.   Tadiran was particularly bad actor in this respect.John,  W8KX
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