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Hi Ralf,
Those look like Odyssey's. My experience with Odysseys is that they are picky about charging voltages and when they fail they tend to fail suddenly. I would suggest going to the Odyssey website and finding their detailed charging instructions, then take the batteries out of the plane and charge as directed, one at a time. (You may need to buy a new charger) See how the voltages look and then make a decision. I think if I had a single bus electrical system, I might consider reverting to a flooded aircraft battery.
I don't really have a scientific justification for that. ...Just that in 13 years of aircraft ownership I have toasted zero flooded batteries and 2 pair of Odyssey's.
Colyn
On Oct 24, 2013, at 9:04 AM, <bronnenmeier@GROBSYSTEMS.COM> <bronnenmeier@GROBSYSTEMS.COM> wrote:
Dear subscribers,
I got a 2x12V=24V battery stack on the firewall behind the oil cooler -
see picture
I started flying the plane in May2011 with about 350hrs since then.
I bought the batteries probably early 2010 and used them during the
start-up process of the electrical systems in the plane.
Last week I thought the first crank revolution during starting felt kind
of weak - what kind of life can I expect out of them?
Does it just get weaker and don't start the engine anymore or would it
more likely die sudden at night in IMC?
I don't have an electrical back up but vacuum instruments and a
flashlight in the cockpit.
Thanks for your input
Ralf
-----Original Message-----
From: Chris Zavatston [mailto:chris_zavatson@yahoo.com] Sent: Tuesday, October 22, 2013 7:54 AM
To: lml@lancaironline.net
Subject: Re: [LML] Re: Odyssey PC680 Batteries on Firewall -- Cool
Enough?
Why was it smoking? Overcharging?
Sent from my spiffy iPhone
On Oct 21, 2013, at 5:02 PM, Colyn Case <colyncase@earthlink.net> wrote:
I haven't been a fan of batteries behind the firewall since my friend
had his battery start smoking IMC in a Cessna 210. He made it but it
wasn't pretty.
On Oct 21, 2013, at 3:58 PM, Steve Colwell wrote:
Ditto.. put the battery or batteries behind the seat too if the CG (or
your
A/C) will allow. Our CG with Pump and 3, 20 amp Panasonic Batteries behind the seats (Hartzell 3 blade) is near the fwd. limit with Claudette solo, no bags and minimum fuel.
Steve Colwell Legacy 550 RG
Move your hydraulic pump from its current location.
Create a small bulkhead and put the pump directly behind your seat.
The reasons are too numerous to list!
Don't even think twice about making this change.
Equally important, locate your pump breaker within easy reach on your
panel.
Angier Ames
N4ZQ
69hrs
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