The Power of Deep Sleep™ Technology from Norsk Lithium.

When boating season ends and it’s time to pull the boat out of the water, your Norsk Lithium batteries deserve a little attention before you call it a year. Winter storage is the perfect time to take advantage of Deep Sleep Mode — a built-in feature that protects your batteries all season long without the need for maintenance charging or disconnection.

Deep Sleep shuts down all non-essential electronics and Bluetooth activity, eliminating any parasitic drain from connected accessories. This means you can leave your batteries installed in the boat — trolling motor, electronics, and all — without worrying about them discharging over time.

At around 60% state of charge, a 12V 105AH Heated Norsk Lithium Marine battery in Deep Sleep would take more than 11 years to fully discharge. That’s how efficient the system is at preserving stored energy, giving you peace of mind through even the longest off-season.

Step-by-Step, Preparing Your Norsk Battery for Winter Storage:

Charge The Battery To 50–60%

Before storage, bring your battery to roughly half charge. This range helps preserve the health of the lithium cells during long-term storage.

Enable Deep Sleep Mode

There are two easy ways to put your battery into Deep Sleep:

• Through the Norsk Guardian® App: Open the app, select your battery, and tap “Enter Deep Sleep.”
• On the battery itself: Press and hold the Power Management button until three lights appear — that’s your signal the battery has entered Deep Sleep.

Store The Battery In A Cool, Dry Place

Once in Deep Sleep, disconnect your charger and store the battery (or the boat) in a cool, dry environment. No maintenance charging is required while the battery is asleep — it’s fully protected and consuming almost no energy.

Real-World Example: A Boat in Winter Storage

Let’s say you’re storing your 21-foot bass boat in an unheated garage for the winter. You pull it out of the water in October, rinse down the hull, and winterize your outboard. Once you’ve charged your Norsk trolling motor batteries to 60%, you open the Norsk Guardian® App and put them into Deep Sleep.

Even though your fish finder and onboard wiring harness remain connected, there’s zero drain on the batteries. Come spring, when you uncover the boat in April, all you need to do is tap “Wake Battery” in the app — or give the Power Management button a quick press — and your batteries will instantly come to life at the same voltage you left them with six months earlier. No trickle charger, no voltage loss, no stress.

Why Deep Sleep Beats Traditional Winterizing Methods

In the past, anglers and boaters had to either remove their batteries completely or keep them connected to a low-amp “maintenance” charger through the off-season. Both options had downsides — traditional chargers risked overcharging or damaging cells, and removing batteries meant rewiring everything come spring.

Deep Sleep eliminates both problems. Your Norsk Lithium Marine battery essentially “hibernates” during storage, protecting itself from drain and extending its lifespan — automatically. It’s maintenance-free, and your boat stays rigged and ready for the first warm weekend on the water.

Waking Up Your Batteries For Spring

When the ice melts and you’re ready to hit the lake again, waking your batteries is as simple as:

• Opening the Norsk Guardian® App and selecting “Wake Battery,” or
• Pressing the Power Management button once.

That’s it. Your batteries are ready to go fishing before you even start loading the boat!

Discover how Deep Sleep technology works and how it keeps your boat batteries protected all winter long:

Deep Sleep — Advanced Battery Storage