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Re: Which Battery Brand is the better buy?
From: Don Smucker (dws_jmcyahoo.com)
Date: Thu, 9 Jul 2015 05:03:43 -0700 (PDT)
According to Concorde, the RG and AGM batteries are the same thing.  This from the Concorde site.

The RG-35AXC Aircraft Battery From
Concorde Battery Corporation

The RG-35AXC is a Concorde Platinum Series Aircraft Battery. The Platinum Series is comprised of premium hand made AGM Aircraft Batteries with excess power for many applications.

RG-35AXC Battery Specifications:
Primary Aircraft Purpose General Aviation AGM Aircraft Battery
Voltage 12v
Rated Capacity C1 = 1 hr.
rate in ampere hours 		33.00
Cold Cranking Amps 440.0
Max Weight 32.00 lb / 14.5 kg
Concorde Battery
Part Number		 Ipp Ipr Ipp Ipr Ipp Ipr
23°C (74°F) -18°C (0°F) -30°C (-22°F)
A A A A A A
RG-35AXC 1200900 800700 625550

Specifications subject to change without notice.
Concorde Aircraft Batteries model RG-35AXC
Click to enlarge

Description of the RG-35AXC Aircraft Battery:


RG-35AXC has the highest cranking power
and capacity in the 35 Group.

Recombinant Gas - The RG® Series are low resistance, valve regulated lead acid (VRLA) batteries.
  • Superior starting power
  • Reliable essential power in the event of a generator failure
  • Low impedance design
  • Maintenance free
  • Constructed with non removable vent valves - no addition of electrolyte or water required
  • Aerobatic: Non spillable at any altitude or attitude
  • Factory tested to assure airworthiness
  • Shipped fully charged and ready to install
  • Manufactured with absorbed glass mat separators (AGM)
  • RG® Series batteries ship Hazmat Exempt



    • On Thursday, July 9, 2015 6:51 AM, Don Smucker via EAA493 <eaa493 [at] fly-web.us> wrote:


    I am a big believer in AGM batteries, basically the same as the Concorde (RG). I put a new AGM in the Velocity.  Unfortunately, it will be some time before I can report how well it performs in that bird........

    Don S



    On Thursday, July 9, 2015 6:31 AM, LeRoy Anderson <landers [at] copper.net> wrote:


    I put a Concorde battery in my old Cherokee and it was four years old when it went down in Corsicana.  The new Cherokee has a Concorde and it is almost five years old.  I do a full discharge capacity test on it at every annual and it is just as good as new, so far.  The battery box stays clean as a whistle between annuals.  I vote for the Concorde.  They do warn that you should not use your old car charger to ensure longevity and I would check your alternator voltage to make sure it does not get over or under charged in the plane.  That's my experience up to now.

    LeRoy

    Sent from my iPad

    On Jul 9, 2015, at 12:25 AM, Don Treadwell <donald [at] treadwellphotography.com> wrote:

    I need to replace a Gill G-25S which is less than two years old.  They have been discontinued and replaced with a new model Gill sealed battery.
    I checked various forums on the internet and found that the majority of owners think that the more expensive Concorde battery is actually cheaper in the long run because it lasts longer and may actually improve with age.
    The Aviation Consumer article found that in their testing that the Concorde battery was more robust, holding up well to abuse like overcharging, and actually improved its capacity as it went through charging cycles.  Some owners did have Concorde batteries fail in less than 2 years (around 22%) while Gill battery owners had a failure rate of 78% in less than 2 years.
    Here is the same article as published in the Aviation Consumer with additional surveys attached.

    Gill used to be the standard in wet cell batteries and those batteries still hold up well if you can stand replacing battery boxes every time one spills sulfuric acid.

    What has your experience been with batteries?

    Don
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