Finding Your Fit: Choosing the Right Battery for the Tedgix K4C Electric Fin

TEDGIX K4C BATTERIES FROM PARADISEPAD

Upgrading your SUP or kayak with the Tedgix K4C electric FIN is one of the best ways to fight headwinds, cover more distance, or simply kick back and enjoy an effortless cruise. But when it comes to powering your setup, picking the right battery capacity determines how far—and how long—you can stay on the water.

At Paradisepad, as the largest official Tedgix dealer in the USA, we know these electric fin setups inside and out. As a family-owned USA business, we don't just sell gear—we actively stock spare parts, replacement accessories, and support our paddlers for the long haul.

The K4C setup pairs a 400W motor with three main waterproof lithium battery options: B2, B4, and B8. Here is a breakdown of each battery so you can choose the right one for your style of paddling. 

Tedgix K4C Battery Options

The Battery Lineup at a Glance

Battery Model	Capacity	Est. Cruising Runtime	Top Speed Runtime	Best For
B2 (Cruiser)	190 Wh	~2.0 – 2.5 Hours	~35 – 45 Minutes	Quick sessions, calm lakes, light paddling assist
B4 (Standard)	423 Wh	~4.0 – 5.0 Hours	~1.2 – 1.5 Hours	Half-day trips, extended touring, casual anglers
B8 (Expedition)	808 Wh	~8.0 – 8.75 Hours	~2.0 Hours	Full-day adventures, long touring, heavy currents

The B2 is designed for paddleboarders and kayakers who prioritize light deck weight and quick outings.

• The Vibe: Quick morning workouts, quick laps around the lake, or an emergency safety motor for when you run out of energy.

• Why Choose It: It keeps your board setup light and nimble. If you only need a slight push to cross a windy stretch or want to assist your natural paddling rhythm without dragging heavy gear, the B2 offers plenty of power in a compact package.

The B4 strikes the ultimate sweet spot between total weight and extended range. For most Paradisepad riders, this is the go-to battery.

• The Vibe: Half-day lake explorations, kayak fishing outings, and casual weekend cruises with friends

  Why Choose It: Giving you up to 5 hours at a steady cruising speed, the B4 gives you the freedom to explore without constantly watching your power level. It handles mixed-speed use effortlessly without adding excessive bulk to your board.

  When you refuse to turn back early, the B8 provides heavy-duty endurance.

  • The Vibe: All-day expeditions, river touring, coastal runs, and gear-heavy fishing trips.

  • Why Choose It: Packing 808 Wh of energy, the B8 yields up to 8.75 hours of runtime at cruising speed. If you are tackling strong currents or planning to spend from sunrise to sunset on the water, the extra capacity is well worth the added weight.

When you refuse to turn back early, the B8 provides heavy-duty endurance.

• The Vibe: All-day expeditions, river touring, coastal runs, and gear-heavy fishing trips.

• Why Choose It: Packing 808 Wh of energy, the B8 yields up to 8.75 hours of runtime at cruising speed. If you are tackling strong currents or planning to spend from sunrise to sunset on the water, the extra capacity is well worth the added weight.

How to Choose Your Match

1. How long do you usually stay out?

   • Under 2 hours? Go with B2.

   • 3 to 5 hours? Go with B4.

   • 6+ hours or full-day trips? Go with B8.

2. What are your water conditions? Fighting ocean chop, river currents, or headwind burns battery faster. If you consistently face heavy conditions, size up one step (e.g., choose a B4 instead of a B2).

3. Paddling vs. Cruising: If you plan to paddle continuously and just use the eFIN for a low-power boost, smaller capacities go much further. If you intend to rely heavily on motor throttle, favor the B4 or B8.

Ready to electrify your next water session? Explore our Tedgix K4C Electric Fin Motor at Paradisepad and grab the battery setup built for your style of adventure!