Concorde RG-35AXC Platinum Series Sealed Lead Acid Aircraft Battery

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Part# 11-03882
MFR Model# RG-35AXC


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

Recombinant Gas - The RGŪ 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)
  • RGŪ Series batteries ship Hazmat Exempt

NOTE: This aircraft battery is not designed or intended for turbine aircraft engine starting applications. Warranty coverage applies to reciprocating aircraft engine starting, and standby / essential power installations.

*NOTE* - The STC for some aircraft is available at an additional cost please call 877-4-SPRUCE (777823) if applicable to your aircraft.

Battery Type
Ampere Hours
Max. Weight
Our P/N
Battery Diagram PDF
Extra Cranking
32 lbs.
California Prop 65 Warning Symbol

WARNING: The product may contain and/or expose you to a chemical(s) or substance(s) which are known to the State of California to cause cancer and/or birth defects or other reproductive harm.


Installed one of these about 3 years ago. Last week my charging system quit in flight in my Saratoga. With the concorde battery powering everything, I was able to run avionics for nearly 30 minutes until I got back to the airport, lower my landing gear and it was still at 12.3 volts. I mean it still had enough power to re-start the engine. I think it would have run the avionics and other equipment for a full hour or more if necessary. This experience made me feel like the extra money spent on the concorde battery was well worth it. I dont know that other batteries would have lasted until landing (and probably not had the power to get the gear down and light the critical 3 green lights). It turned what could have been a tense and challenging flight into a minor event.

Al L
January 29, 2023

Excellent battery. Last one lasted 7 years of being abused by the previous owner (not flying it or charging it and letting it freeze dead repeatedly). SInce the last owner didnt log the battery installation, Concorde helped me determine its age via the serial #. Quickly and happily. Price is ridiculous, but for ~$75/yr its not bad. Hopefully the next one will last longer with the BatteryMinder on it.

William A Verified Purchase


January 18, 2023

Great battery, but very expensive. Last time I bought one the price was 60% of the current price. The good news is that it last 2X longer than the warranty.

Roger B Verified Purchase


December 27, 2022

Fast shipping on battery. We’ll pack double boxed. Fair price.

Dennis M Verified Purchase


December 23, 2022

Put it in the Bonanza and works great!!!

Brad T Verified Purchase


December 23, 2022

Great price, great service!, always satisfied with aircraft spruce!

Wayne A Verified Purchase


December 17, 2022

The battery arrived promptly and was fully charged and ready to install. Excellent response and delivery!

Robert K Verified Purchase


December 15, 2022

Great product at a good price and quick delivery!!

John G Verified Purchase


December 14, 2022

I had the same battery, it was 2 years old and had a bad cell, things happen so can’t be too hard on the product just yet.

Jeffrey H Verified Purchase


December 6, 2022

Great product, third one I have purchased. Nothing wrongdoing with the one I replaced just change out every three years

Steve I Verified Purchase


December 6, 2022


Please note, Pilotshop's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Pilotshop assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Is this battery a drop-in replacement for my current Gill battery in my 182? Or will I be required to: 1) purchase a volt meter to determine if it is charged. 2) get a torque wrench that measures inch pounds to ensure the terminals are not over torqued. 3) have an a&p ia do the paperwork to approve the install 4) modify the battery box lid so it closes properly 5) get a special trickle charger that works specifically for this battery. As an owner, I just want to replace the battery and go fly. Regards, Greg

Yes, this is a drop in replacement for this aircraft. 1) We maintain the charge in the batteries while they are in stock. A volt meter is a good way to determine present state of charge. 2) Please do pay special attention to avoid over-torquing. Torque information comes with the battery. 3) You need to contact the local FSDO for this question. per the manufacturer, we have an STC and PMA. The STC is available at no charge. Per Concorde, they just need the information sheet completed and they can can email for free. 4) Some installations do require modification of the battery box cover. This is covered in the STC. 5) We only recommend the BatteryMINDers listed under the "Accessories" tab of this web page

Q: Will it hurt this battery to trickle charge it? RG-35AXC

No, trickle charging this battery should cause any harm to the battery.

Q: I just purchased a Concorde RG-35 AXC battery. In the Q&A section, it says an STC is available at no charge. How do I go about obtaining the STC?

There is a form that is available in the "Documents" tab. It is the first one listed. Please download it, fill it out, and send it to Concorde and they will send the STC at no charge.

Q: What is the CCA rating of this RG-35AXC battery?

The cold crank amps rating is 440.0.

Q: I've had the RG-35AXC for about2 1/2 years now and haven't been flying to much lately, plane has been sitting for almost a year.. I try to go out and start and run the engine once a week or so. The temps here in Miami and rather high, I mean HOT. anyway the battery appears to be really low and won't turn over the engine. What is the best way to charge it back up...right now I'm using a slow 2amp charge or should I boost that up higher???

Concorde recommends the battery minder part number 11-07739 for charging, this is an 8 amp charger.

Q: Are the Concorde RG-35A and the RG-35AXC batteries the same physical size?

Yes, they are the same size.

Q: Is the RG-35AXC a drop-in replacement for the Concord RG-35?

Yes, the application is the same for both RG-35A and the RG-35AXC. The XC model is extra cranking and provides the highest cranking power and capacity in the 35 line. It is commonly used in cold weather applications.

Q: What are the dimensions of this RG-35AXC battery? I want to make sure it fits in my battery box.

Please see the link for the "Download RG-35AXC Diagram" in the 'Overview' tab of the web page. The dimensional drawing is included in the PDF.

Q: What is the CCa of the RG-35axc?

The cold crank amps rating is 440.0.

Q: Will the RG-35AXC fit my PA-28-180?

Yes, per the application chart, the RG-35AXC should be the correct battery for your aircraft.