I have had best service from the Concorde RG sealed units. I think I have the RG24-15. It's PMA'ed for our aircraft. I try to fly once a week but miss a few in a years time but these batts have been giving me about 5 years service.
http://www.aircraftspruce.com/catalo...bility-new.pdf
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Herb R Harney
1968 337C
Flying the same Skymaster for 47 years
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