T-H Marine HYDRA Battery Cable Extender Kit — Positive & Negative Terminals, Fits up to 2 AWG, 5/16-18 SS Stud

The T-H Marine HYDRA Battery Cable Extender Kit is a reusable positive-and-negative terminal extension that lets you move battery connections up to 2-gauge wire away from cramped battery posts for easier, cleaner marine wiring.

Boaters often need additional, accessible connection points for accessories, chargers, and lights without creating messy splices at the factory battery posts. The HYDRA Battery Cable Extender provides both positive and negative terminals, stainless steel 5/16-18 studs, and a latching protective case so you can relocate wiring, reduce butt splices, and better seal in-line connections against the marine environment.

How does this extender make battery access easier?

Instead of working directly on crowded battery terminals, the extender lets you route a short run of heavy cable to a more convenient location. That saves time when adding equipment, maintaining connections, or connecting chargers.

• Moves connections away from tight battery wells for easier access.
• Provides dedicated positive and negative posts for accessories and charging.
• Reusable latch case keeps the in-line connection protected and tidy.

Will the terminals handle heavy marine wiring?

Yes—the HYDRA extender terminals accept up to 2-gauge wire, a common heavy-duty size for marine circuits. Stainless steel studs and hardware provide secure mechanical fastening for reliable current flow and corrosion resistance in a saltwater environment.

• Accepts wire up to 2 AWG for strong power transfer.
• 5/16-18 stainless steel stud gives durable thread engagement.
• Hardware resists corrosion for longer life in marine conditions.

How does this reduce unwanted splices and improve rigging?

By offering new, solid terminal posts, the extender eliminates the need to splice into factory wiring or add multiple butt connectors. That results in cleaner installations that are easier to troubleshoot and less likely to develop loose joints over time.

• Creates dedicated connection points, avoiding messy butt splices.
• Streamlines wiring runs for accessories, chargers, and lights.
• Protected case helps keep the inline join sealed with grease or sealant.

What protection does the kit provide for the inline connection?

The extender includes a reusable snap-latch case that covers the in-line terminal area. Use a marine-grade sealant or grease inside the case to enhance moisture resistance while keeping the connection serviceable for future adjustments.

• Latchable protective case shields the connection from spray and dirt.
• Case is reusable for maintenance access without cutting wiring.
• Designed to accept additional sealant or grease for improved protection.

Who is this for: The T-H Marine HYDRA Battery Cable Extender Kit is ideal for boat owners, marine electricians, and DIY installers who want neater, more accessible battery connections. It suits vessels that need to add accessories, install onboard chargers, or tidy factory rigging without heavy splicing. If you work with up to 2‑gauge battery cabling and want a corrosion-resistant, serviceable solution, this kit simplifies installations and ongoing maintenance.