Britax 70G3E9LJ51Q

Marathon 70-G3 E9LJ51Q Convertible Car Seat with Side Impact Protection, Steel Bars, and Harness Ultra Guard Chest Pads, in Cowmooflage

March Mania Sale

Share: Add To Kaboodle

Click to Enlarge
Click to Enlarge
Click to Enlarge
View and share related images
Britax Products
Model #:

Britax 70G3E9LJ51Q

Britax Marathon 70-G3 E9LJ51Q Convertible Car Seat with Side Impact Protection, Steel Bars, and Harness Ultra Guard Chest Pads, in Cowmooflage
Rating: (Write a Review)
This product is currently unavailable.

Payment Options Why Buy From Us

Britax Products
Quick Specs:
Brand: Britax
SKU: 70G3E9LJ51Q
Stock Id: SID319060
Series: Marathon Series
Color: Cowmooflage
Width: 18.5"
Height: 26"
Depth: 21"
Technical Details
Series: Marathon
Product Weight: 19.5
Forward Facing: 1 year and 20, up to 70
Child Weight Rear Facing: 5 - 40
Child Standing Height: 49" or less
Seating Compartment Height: 23.5"
Seat Area Depth / Width: 11" / 11"
Buckle Strap Depths: 5 / 7.5
Child Seated Shoulder Height Rear Facing: 9 - 16.75
Shoulder Width: 13"

EZ-Buckle System retains the harness buckle in a forward position and prevents the child from sitting on the buckle when boarding.


Base with SafeCell Technology

  • Designed to compress in a crash, significantly lowering the center of gravity and counteracting the forward rotation of the child seat which normally propels the child toward the front seat.

Integrated Steel Bars

  • Strengthens the connection to the vehicle and reduces forward flexing of the child seat during a crash.

Energy-Absorbing Versa-Tether

  • Features a staged-release tether webbing to slow the forward movement, reducing the crash forces reaching the child.
  • Two-point attachment to minimize forward rotation while anchoring the top of the child seat.

Side ImpactProtection

  • Comprised of deep side walls lined with energy-absorbing EPP foam distributes crash forces, shields from vehicle intrusion, and contains the head, neck and body.

HUGS (Harness Ultra Guard System) Chest Pads

  • Provides resistance to forward movement in the event of a crash.

Tangle-Free, Five-Point Harness

  • Distributes crash forces across the strongest parts of the body and provides a secure fit.

Additional Features

  • 70-pound Weight Capacity for safety and comfort as your child grows.
  • Rear and Forward Facing Recline for child comfort and positioning.
  • High Density Comfort Foam provides an extra layer of padding to gently cushion your child.
  • Plush, Easy-Remove Cover with matching comfort pads and infant body pillow to provide extra comfort and easy cleaning without disassembling or uninstalling the child seat.
  • Two Buckle Positions offer a snug and secure fit for your growing child.
  • Infant Positioning Insert may be necessary for small infants to achieve a snug fit of the harness around your child (sold separately).
  • Quick-Adjust, No-Rethread Harness repositions the harness shoulder height without disassembling the harness straps.
  • Premium Lower LATCH Connectors for a quick and simple installation featuring a push button for easy release.
  • Built-in Lock-Offs ensure a snug lap and shoulder belt installation with minimal effort.
  • Anti-Slip, Contoured Base grips and protects the vehicle seat while offering optimum vehicle fit.
  • Harness Holders keep harness straps pulled to the sides when placing your child in the car seat.
  • Certified for Aircraft Travel.
  • Made in the USA with global components.


Child Weight (lbs)Rear Facing: 5 - 40
Forward Facing1 year and 20, up to 70
Child Standing Height (in)49" or less
Child Seated Shoulder Height (in)Rear Facing: 9 - 16.75
Forward Facing12 - 16.75
Product Weight (lbs)19.5
Seating Compartment Height23.5"
Seat Area Depth / Width11" / 11"
Shoulder Width13"
Harness Slot Heights8.5 / 9.5 / 10.5 / 11.5 / 12.5 / 13.5 / 14.5 / 15.5 / 16.5 / 17.5
Buckle Strap Depths5 / 7.5

Britax 70G3E9LJ51Q Reviews & Ratings

5 Star:
0 Reviews
4 Star:
0 Reviews
3 Star:
0 Reviews
2 Star:
0 Reviews
1 Star:
0 Reviews
   Average Customer Review:

Share your thoughts with other customers:
Write a Review

McAfee SECURE sites help keep you safe from identity theft, credit card fraud, spyware, spam, viruses and online scams

PriceGrabber User Ratings for Security Verified Seal online shopping online shopping is upfront