eBike Battery Harness, XT60 XT90-S or SB50 Plug

Overview

An ebike battery harness is the short, heavy-gauge lead between a pack and a controller, a charger or a distribution point. The pack side carries the connector the battery already has; the equipment side ends in tinned flying leads or crimped ring terminals. Builds cover battery-to-controller conversion, pack extension, charger pigtails, and the replacement leads that repair shops get through steadily. It is a simple part to draw and an easy one to get wrong, because the failure modes are all thermal or mechanical rather than electrical.

Key Specifications

Battery-side connector	XT60, XT90 / XT90-S anti-spark, or SB50-type housing (compatible parts)
Equipment end	Tinned bare leads or crimped ring terminals
Conductor size	10-14 AWG high-strand silicone; 8 AWG for high-power builds
Cable length	150-600 mm, red and black pair
Protection option	Inline fuse holder, 30 A or 50 A, to order
Jacket material	High-strand flexible silicone insulation
Options	Sealed Higo-type connector, custom phase colors, printed markings

Connector options, and what each one is chosen for

Connector	Why it gets chosen	Note
XT60	Common on mid-power packs and chargers	Compact, widely stocked, easy to service
XT90 / XT90-S	Higher power packs; the S variant adds an anti-spark path	Anti-spark matters where the pack is connected often
SB50-type housing	Two-pole format used on larger packs and service connectors, built to the Anderson Powerpole format	Polarized housing, replaceable contacts
Sealed Higo-type	OEM builds where the harness runs outside the frame	Sealed against spray and wash

Connector names above belong to their respective owners. These harnesses are built with compatible components and are not supplied by those brands. Current figures published for each connector family are the maker values; the rating your assembly is built and verified to is the one on your drawing.

Sizing the lead

Conductor	Typical use	Note
14 AWG	Lower power city and folding bikes, short runs	Most flexible of the range
12 AWG	General e-bike and cargo builds	The usual default
10 AWG	Higher current controllers and longer runs	Stiffer, needs a larger bend radius
8 AWG	High power drives	At this size the crimp and the connector usually become the limiting parts, not the cable

Gauge follows the controller current and the length of the run, and we size it with you against your drawing rather than against a rule of thumb. High-strand silicone insulation is the default because it stays flexible in cold weather and takes the vibration a frame transmits. Red and black pairs are standard; other jacket colors are available where a build identifies phases or carries a separate sense lead.

Why the original lead fails

Failure	Where it starts	What prevents it
Cracked crimp at the connector	Vibration carried by the crimp rather than the cable	Strain relief on the cable, support at both ends
Heat at the connector face	Contact resistance from a worn or undersized contact	Correct contact size, pull-test every termination
Chafe through the jacket	Frame pivots, chain line, brake rotor	Route away from moving parts, use frame grommets
Green corrosion up the strands	Water tracking in behind the boot	Adhesive-lined heat shrink, sealed connectors outside the frame

Installation

Fit an inline fuse or a breaker as close to the battery terminal as you can, sized to the controller rather than to the wire alone. A 30 A or 50 A holder is the usual choice.
Keep the run short and route it away from the motor casing, brake rotor, chain line and any folding or suspension pivot, using the frame grommets where they exist.
Support the harness at both ends so vibration is not carried by the crimp.
Terminate with a proper hexagonal crimp, pull-test every termination, and insulate the joint with adhesive-lined heat shrink.
Check polarity with a meter before the pack is connected for the first time. Guessing here is expensive.

Typical applications for this ebike battery harness

Battery-to-controller conversion leads and pack extensions
Charger pigtails and service leads for repair shops, alongside our DC plug XT60 cable with Anderson SB50 option
Replacement harnesses for cargo, folding and fat-tire builds
Dual-battery and range-extender installs where two packs feed one controller
Test rigs and burn-in stands, paired with our heavy-duty ring terminal battery lead cable

Ordering notes

Length from 150 mm to 600 mm, measured overall.
Connector combination on each end.
Whether an inline fuse holder is needed, and its current rating.
Whether the sealed OEM version is required for an external run.
Polarity convention, and any color or marking requirement.

For eBike Battery builds, prototypes run from 1 to 50 pcs with a 3 working day turnaround. Volume orders begin at 500 pcs and ship 14 working days after approval. Tooling not already held adds around 10 working days. eBike builds go out under your part number and labeling, and material certificates and first-article reports are available on request.

Workmanship and testing

eBike Battery builds are made to IPC/WHMA-A-620 Class 3 workmanship inside an ISO 9001 system, over a 32 to 12 AWG range. Each eBike unit passes a 100% continuity and pinout check before it ships, and seal checking is quoted whenever an ingress rating is on the drawing.

Material declarations against RoHS and REACH are issued per project, alongside the dimensional and electrical reports agreed at quotation; see certifications, compliance and material declarations. Where your drawing names a UL style or another approval, the build follows your drawing and ships with the supporting document rather than a claim of our own. The strain relief and molded body are produced on tooling we cut ourselves see in-house mold making and overmold tooling so the tool is quoted separately, owned by you, and available for repeat runs years later. Related reading: what changes on vehicle harness builds.

Related battery and power leads

Full range: automotive cable and wire harness assemblies and DC plug power cable.

Frequently Asked Questions

Can I mix XT60 on one end and SB50 on the other?

Yes. The two ends are specified independently, and mixed builds are common on conversion and service leads.

Do I need the anti-spark XT90-S?

Choose it when the pack is connected and disconnected often. The spark on a plain connector erodes the contacts over time.

What size fuse holder should I order?

Size it to the controller, not to the cable. A 30 A or 50 A holder covers most builds; tell us the controller rating and we will match it.

Do you supply the connectors you name?

We build with compatible components. Those names belong to their respective owners and we are not supplied by those brands.

eBike Battery Harness with XT60, XT90-S or SB50 Plug