Fortress 1700 Battery
Keep the "Canadian Legend" Rolling. We Come to You.
The Fortress 1700 Series is widely considered the "Toyota Land Cruiser" of mobility scooters. Whether you drive the 3-wheel (TA) or the 4-wheel (DT) model, you own one of the most durable, reliable, and well-engineered machines ever built.
Because these scooters were built to last for decades, many are still on the road today. However, even a tank needs fuel. If your Fortress is struggling to hold a charge or feels sluggish on the hills it used to climb easily, it isn't time to retire the scooter—it’s just time to replace the energy source.
At MobileBattery, we are specialists in servicing legacy Fortress models. We understand the specific battery requirements of the 1700 series and bring the right parts directly to your door, saving you the struggle of transporting this heavy-duty machine to a repair shop.
The Fortress Battery "Secret": Size Matters
There is a common misconception about the Fortress 1700 that leads to many poor repairs.
Many general repair shops try to install smaller Group U1 (35Ah) batteries to save money. While these physically fit in the tray, they are underpowered for the Fortress’s heavy steel frame and powerful motor. This results in poor range and rapid battery failure.
The MobileBattery Standard: We only install Group 22NF (55Ah) batteries in the Fortress 1700.
Why? The 1700 series was designed for long-range reliability. The Group 22NF provides nearly 60% more energy capacity than the smaller U1 size.
The Fitment Challenge: The battery compartment under the Fortress seat is a tight steel tray. Many generic automotive Group 22NF batteries are slightly too long, leading to rubbed wires or stuck batteries. We stock specialized mobility-spec casings that fit the Fortress tray perfectly, ensuring a safe, rattle-free installation.
Choose Your Performance Tier
We offer two distinct power options for your Fortress 1700, allowing you to choose the range that fits your lifestyle.
Option A: The Standard (AGM)
"The Factory Restore." This is the high-quality, direct replacement for the original batteries that came with your scooter. It restores the reliability you remember.
Best For: Daily errands, shopping centers, and paved pathways.
Tech Spec: 55Ah Absorbent Glass Mat (AGM) - Sealed & Maintenance Free.
Option B: The Upgrade (Discover® EV Dry Cell)
"Modern Tech for a Classic Machine." Just because your scooter is older doesn't mean your battery technology has to be. The Discover® Dry Cell is a premium upgrade that outperforms standard AGM batteries in every metric.
More Range: Delivers superior runtime for longer trips.
Winter Performance: Highly resistant to cold weather voltage drops, perfect for Canadian winters.
Longevity: Designed to withstand the deep discharge cycles of older, high-torque motors.
Why Fortress Owners Call MobileBattery
The Fortress 1700 is built like a tank—and it weighs like one.
The Challenge: To access the batteries, the heavy "Captain’s Seat" must be removed, followed by the rear body shroud (which is often held by older, delicate clips). The batteries themselves sit deep in the chassis, requiring significant lifting strength to remove.
Our Solution:
Zero Heavy Lifting: Our mobile technicians handle the entire disassembly and reassembly process in your driveway.
Preserving Your Scooter: We know how to handle the older plastic shrouds carefully to prevent cracking—a common issue when untrained mechanics force the cover open.
Contact Cleaning: Older scooters often develop corrosion on the battery terminals. We clean and treat your connections during the install to ensure maximum power flow.
Frequently Asked Questions (FAQ)
Is my Fortress 1700 worth fixing?
Absolutely. The Fortress 1700 is renowned for its build quality. A new scooter of similar durability costs upwards of $5,000 today. Replacing the batteries is a fraction of the cost and restores the machine to like-new performance for years to come.
How far can a Fortress 1700 go on new batteries?
With fresh Group 22NF batteries, a healthy Fortress 1700 can typically achieve 30km to 40km per charge, depending on the terrain and rider weight.
My battery gauge shows "Full" but drops to empty when I move. Why?
This is the classic sign of "Dead Cells." The batteries have enough surface charge to show 24 volts when resting, but they cannot support the amperage load of the motor. This confirms the batteries have reached the end of their life and need immediate replacement.