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Battery Box Mod STC SA4008NM

Bogert Aviation

  • $ 10800

I need Concorde Battery Adapters ($89)

The Battery Box Modification greatly improves battery performance. It modifies Piper Metal Battery Boxes to eliminate the braided straps and ground connections known for heat generating, high resistance connection.

Hard starting and other electrical problems can often be tracked back to poor battery and group connections. Use this inexpensive mod with a new positive and negative cable if your battery box is still mechanically sound.

This is Battery Box Modification ONLY, it is best purchased for customers who have already purchased and installed Bogert Aviation's "Low-Loss" Copper Cable Kit (03M-KIT/ STC SA3531NM).  To simplify your purchase of Battery Box Modification and Battery Positive and Battery Negative Cables, please click here to purchase all items together (08M-SET).

The Battery Box Mod comes with Adhesive Templates to make the U-Shaped cut outs on the existing battery box. The modification also includes the U-shaped Flanges, a Cover Plate to seal the old insulator hole and Rivets. The Flanges accommodate Bogert’s "Low-Loss" Copper cables; The entire flange slides in and out of the slots making access to the battery quick and easy. Paperwork includes the FAA/PMA approved STC SA4008NM, AML, Instructions and a sample 337 form entry.



  • Improve starting performance
  • Easier to remove and install the battery
  • May prolong life of battery and starter
  • Eliminate extra connection on outside of the battery box
  • STC FAA/PMA approved for many Piper Aircraft
  • Eliminate the troublesome braided negative strap as well as the extra connection at the positive insulator



    • Less expensive to modify the existing box than to replace it.
    • Mod and Positive and Negative Cables are less costly than new braided straps.
    • Compatible with our famous “Low Loss” Cable Kits
    • Nylon inserts guard against battery grounding or unwanted mishaps
    • Add positive and negative copper cables for additional charge
    • Made in the USA


    • 2 ea. Nylon Flanges (with Grommet assembled)
    • 1 ea. Cover Plate with Rivets
    • Template for Modification to existing box

    This is the Battery Box Modification Only. 

    This does not include Positive and Negative Cables.  

    Below is a list of all the aircraft included in this STC.


    Aircraft Make Aircraft Model Type Certificate Number Certification Basis for Alteration *FAA Drawing List
    AML Revision Date
    Piper PA-18, PA-18S, PA-18-"105", PA-18S-"105", PA-18A, PA-18-"125", PA-18- "135", PA-18A "135", PA-18S "135", PA-18 "150", PA-18A "150", PA-18S "150", PA-18AS "150" 1A2

    CAR 3 and TCDS 1A2

    1-1 10/14/03 4/12/04
    Piper PA-20 "115", PA-20S "115", PA-20 "135", PA-20S- "135" 1A4 CAR 3 and TCDS 1A4 1-1 10/14/03 4/12/04
    Piper PA-22-135, PA-22-108, PA-22S-135, PA-22-150, PA-22-160, PA-22S-160 1A6 CAR 3 and TCDS 1A6 1-1 10/14/03 4/12/04
    Piper PA-23, PA-23-160, PA-23-235, PA-23-250 1A10 CAR 3 and TCDS 1A10 1-1 10/14/03 4/12/04
    Piper PA-24, PA-24-250, PA-24-260, PA-24-260 1A15 CAR3 and TCDS 1A15 1-1 10/14/03 4/12/04
    Piper PA-25, PA-25-235, PA-25-260 2A10 CAR 3 and TCDS 2A10 1-1 10/14/03 4/12/04
    Piper PA-28-140, PA-28-150, PA-28-160, PA-28-161, PA-28-180, PA-28-235, PA-28R-180, PA-28R-200, PA-28RT-201 2A13 FAR 23 and TCDS A1EA 1-1 10/14/03 6/30/04
    Piper PA-30, PA-39 A1EA FAR 23 and TCDS A1EA 1-1 10/14/03 4/12/04
    Piper PA-32-301, PA-32-260, PA-32-300, PA-32R-300 2A13 FAR 23 and TCDS 2A13 1-1 10/14/03 4/12/04

    Customer Reviews

    Based on 6 reviews
    Shane McKee (Seattle, US)
    Battery Box Mod STC SA4008NM Review

    I am very satisfied with the battery box mod STC. the quality of the materials is good and the installation instructions are easy to follow. Big improvement over the stock battery connections.

    Gregory Stiel (Fredericksburg, US)

    Battery Box Mod STC SA4008NM

    Robin Diel (Penn Valley, US)
    Great product with good installation instructions.

    Great product with good installation instructions. I only wish it came with two sheet metal disks instead of one. My Tri-Pacer battery box had two of the old battery cable pass-through holes versus one. I'll have to make a second sheet metal disk to cover the second hole by using the disk in the kit as a template. Not a big problem, but two sheet metal disks per kit might be a nice option to include during the purchase selection process in future.

    Robin, I'm sorry that you didn't get the second plate. Most installations only require one. The PA 20 and PA22 are exceptions to the rule. It is our habit to include the second plate at no charge when we know it is being used on those airplanes. I am glad you are happy with the product otherwise.

    Joaquin Castro
    I ma a happy customer

    The lady that help me place the order on the phone was very knowledgeable and helpful.
    The kit was delivered in 48 hours. The materials are very good quality the instructions are thorough.
    I am very happy with your product and your service.
    Unfortunately I have not finished the installation due to other priorities including attending Sun-N-Fun.

    Excellent service!

    Fast shipping, well packaged parts and all paperwork included. Customer service was quick to get the right kit for me and get it sent. Couldn’t have been a better experience.

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