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Battery slow to take charge

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grant.corriveau(at)TELUS.
Guest

Posted: Sat Jun 21, 2008 1:07 pm Post subject: Battery slow to take charge

I have dual 18ah RGB batteries ala a Bob Nucholls design that  

provides max. battery redundancy - something I wanted for an  

automotive conversion with electronic ignition and electric fuel pumps.



No. 1 Batt is brand new and operates as expected, taking a charge  

immediately after engine start.



But Batt 2 (two years old) won't take a charge initially even up to  

3,000 engine rpm.  During and After flight, when I check, No. 2 Batt.  

is taking a charge and behaving normally.  I've checked/tightened all  

the connections etc....  I guess I should actually put a meter  

through it to ground and see how the resistance compares in case I do  

have a corroded contact.



But is it possible that the battery itself has internal problems  

causing this?  This seems strange with only 2 years of life on it.



thanks

Grant

GHTF

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jetboy

Joined: 22 Jul 2006
Posts: 233

Posted: Fri Jun 27, 2008 2:06 pm Post subject: Re: Battery slow to take charge

Grant,

         Its possible the older battery has a higher internal resistance than the new one, resulting in a lower charge rate when the same voltage is applied, that is the newer battery takes on the available current until it tops off and allows the second battery to catch up.



Having a DC clamp ammeter to measure each one while in circuit is the easy way to verify, and check which battery supplies the discharge current too.



I just had to replace a VRLA car battery at 3 1/2 yrs although it holds up for starting it lost ability to take on a full charge and I ran a discharge test and found less than half the Amp-hours rating was stored, they can get "tired".



The Odyssey in the aircraft is 8 years old now and doing fine, I have similar AGM types in storage applications at over 15 yrs so it depends a lot on how they are stored, charged, discharged and heated.



The website for  Enersys (previously Gates / Hawker) products is very detailed and useful



Ralph

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Ralph - CH701 / 2200a

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