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Battery bulge

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rhshumaker(at)cox.net
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Posted: Thu Aug 28, 2014 9:01 am Post subject: Battery bulge

My comments to a friend started the recent battery thread on this list.  During an annual on my Glasair I noticed a bulge on the firewall mounted battery which was three inches in diameter and about 3/16 inches high.  I replaced the battery with a new one, and after only one hour of flight time the new battery developed a similar bulge.  For fifteen years I've followed Bob's advice to replace the battery every year, and I've never had a problem until the last two batteries.  They were BatteryPlus (Weiker, 12v, 32 amphr, regular batteries, cost about $80), but the last two batteries were "deep cycle".  The cooling air flow has not been altered; the 60 amp alternator still produces 14.4 volts and the ammeter seems normal.  Question: could my problem be the "deep cycle" property of the last two batteries?  Thanks, Bob in Virginia. END

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nuckolls.bob(at)aeroelect
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Posted: Fri Aug 29, 2014 9:16 am Post subject: Battery bulge

At 12:00 PM 8/28/2014, you wrote:

 	  Quote: 	
		  



My comments to a friend started the recent battery thread on this 

list.  During an annual on my Glasair I noticed a bulge on the 

firewall mounted battery which was three inches in diameter and 

about 3/16 inches high.


	




   On the 'end' or 'broad-side'?



 	  Quote: 	
		  I replaced the battery with a new one, and after only one hour of 

flight time the new battery developed a similar bulge.  For fifteen 

years I've followed Bob's advice to replace the battery every year, 

and I've never had a problem until the last two batteries.  They 

were BatteryPlus (Weiker, 12v, 32 amphr, regular batteries, cost 

about $80), but the last two batteries were "deep cycle".


	


   That's a really big battery for an airplane . . . what

   are your battery-only endurance targets?

 	  Quote: 	
		     The cooling air flow has not been altered; the 60 amp alternator 

 still produces 14.4 volts and the ammeter seems normal.  Question: 

 could my problem be the "deep cycle" property of the last two 

 batteries?  Thanks, Bob in Virginia. END


	


   Could be . . . do you still have them?

   Bob . . .

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