E-Bike Battery Compartment Measurement & Fitment Guide
How to Measure Your Battery Compartment for a Perfect Fit
Avoid fitment issues, pinched wires, and sizing errors. Learn how to accurately measure your e-bike, e-dirt bike, or custom frame space before ordering a custom lithium battery pack.
4-Step Measuring Workflow
Measure Maximum Interior Space
Use a rigid tape measure or caliper to record the absolute maximum internal Length, Width, and Height (L × W × H) of your frame tray or compartment.
Rule: Measure at the narrowest point of the frame, taking internal frame welds or bolt heads into account.
Deduct Cable & Plug Bend Clearance
Heavy-gauge AWG cables and anti-spark connectors (QS8, XT90) require bending radius clearance above or beside the battery pack.
Rule: Deduct 15mm - 20mm from the total height or length where main discharge cables exit.
Account for Protective Foam
To prevent vibration damage during off-road trail riding, battery packs must be surrounded by high-density EVA foam padding.
Rule: Reserve 3mm - 5mm on all sides for EVA foam padding to absorb trail impacts.
Verify Lid Risers & Hatch Extensions
For factory dirt bikes (Sur-Ron, Talaria), high-capacity packs (40Ah/50Ah) exceed OEM height. Check if you plan to use a 3D-printed or billet Lid Riser.
Rule: Specify if your height measurement includes a Lid Riser extension (+20mm to +50mm).
Common Sizing Mistakes to Avoid
Ignoring Weld Seams & Bolt Heads
Inner frame weld seams or protruding controller mounting bolts can subtract 3-5mm of usable internal width. Always measure between protruding hardware, not flat walls.
Forgetting Cable Exit Location
If discharge cables exit from the top of the metal casing, rigid 8AWG silicon wire requires vertical bending space under the frame latch. Top-exit packs need extra height clearance.
Confusing Outer Shell Dimensions
A metal case pack adds approximately 2-3mm wall thickness compared to standard blue PVC shrink wrap. Ensure you specify whether your space limit requires PVC or Metal Armor.
Standard Bike Frame Compartment Reference
| Bike Platform | Stock Space (W × D × H) | Max Fitment Without Riser | Requires Lid Riser | Recommended Connector |
|---|---|---|---|---|
| Sur-Ron Light Bee X | 150mm × 140mm × 380mm | 60V 30Ah / 72V 30Ah Slim | 60V 40Ah / 72V 50Ah (+20-50mm) | Sur-Ron OEM / QS8 Anti-Spark |
| Talaria Sting MX3 / MX4 | 155mm × 145mm × 390mm | 60V 38Ah / 72V 38Ah Direct | 72V 42Ah / 72V 50Ah (+20-40mm) | Talaria Plug / QS8 Anti-Spark |
| Talaria XXX (Supermoto) | 115mm × 135mm × 410mm | 60V 30Ah / 72V 30Ah Slim Slide | Bottom Slide (Not Applicable) | Talaria XXX Direct Harness |
| Stealth Bomber / EEB Frame | 140mm × 200mm × 360mm+ | 72V 40Ah / 72V 60Ah Triangle | Custom Frame Side Panels | QS8 / XT90-S / Anderson |
Frequently Asked Questions
Q: How do I test fitment before ordering a custom battery?
A: The easiest method is constructing a simple cardboard box using your target battery pack dimensions. Slide the cardboard mockup into your frame tray to test hatch closure and cable clearance.
Q: What is the thickness difference between Blue PVC and Metal Casing?
A: Blue PVC shrink wrap adds roughly 1.5mm to the total pack dimensions. Heavy-duty aluminum or steel metal armor cases add 3mm to 5mm overall outer dimensions for impact protection.
Q: What if my custom frame has an irregular triangle or angled shape?
A: Take photos of your frame compartment with a measuring tape positioned along the edges, or submit a 2D CAD/hand-drawn diagram to our engineering team when requesting a custom quote.
