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Old 03-02-2017, 01:41 PM
jeffw@sc47's Avatar
jeffw@sc47 jeffw@sc47 is offline
Join Date: Aug 2014
Location: Simpsonville, SC (SC47)
Posts: 118
Default RV14 second battery

What is a good location on the firewall for a second battery.

Especially anyone who has mounted a second battery and found that it was the ideal location or found that somewhere else would have been better.
Jeff Warren
Simpsonville, SC (SC47)
1946 Bellanca Cruisair 14-13-2 (70 YRS OLD 8/15/16)
RV14A (N14ZT), Ser#140195
Empennage 10/11/14 - 6/15/15
SB Wing 7/22/15 - 8/12/16
Rcvd QB Fuse and Finish kits 10/10/16
QB Fuse substantial completion 12/7/16
Finish Kit started 1/11/17
Engine / Prop ordered April 2017
Dues paid 11/11/16 (USA 2/67-2/70)
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Old 03-02-2017, 03:02 PM
asw20c asw20c is offline
Join Date: Jun 2010
Location: Edgewood, NM
Posts: 62

I recently discovered some corrosion on the belly of my Cessna 180 that was later traced back to the battery vent tube a few feet forward on the bottom of the fuselage. Apparently for a reason I still have not determined, the fairly new battery I installed decided to offload some of its electrolyte that discharged through the vent and resulted in the bit of corrosion I found. The reason I tell this story is because my A&P suggested that maybe at some point it was overcharging and boiled off, so it got me to thinking about batteries mounted on the firewall in an environment MUCH hotter than underneath my baggage area. There were some posts here not long ago with people offering temperatures they have recorded in this very area that were hot enough to be a real problem (I would think) for a battery with plastic housing. Are batteries designed to withstand boiling temperatures as can be expected in this area? I get the desirability of mounting batteries there-favorable CG, a lot less heavy cable required, easier access, etc. But what about temperature?
Empennage Started
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Old 03-02-2017, 05:55 PM
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JohnInReno JohnInReno is offline
Join Date: Jun 2005
Location: Fermley, NV
Posts: 214
Default Batery temp

I think your AP was right to suggest over-charging. This EX900 battery on the firewall of my RV9A shows a max temp of 150 degrees f after one year including Arizona summers. I do not open the oil door to help cool.
John Morgensen
RV-9A N946PM 400+ hours since 2013
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Old 03-02-2017, 07:08 PM
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N941WR N941WR is offline
Join Date: Jan 2005
Location: SC
Posts: 10,757

Why do you need a second battery?

Whatever EFIS you pick will have its own backup battery.

If you pick an ignition that can run independently of your aircraft's electrical system, what else do you need?

Jeff, give me a call so we can discuss your options.
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
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