Robot Mower Battery Winter Storage: Charge, Top-Ups and Cold

The battery is the part of a robot mower that winter storage is really about. Get the charge right before it goes on the shelf and it wakes up in spring like nothing happened. Get it wrong and it can come out of the winter dead, which is the usual way a robot mower’s battery ends up replaced years early.

The short answer:

• Charge it to 85% or more on its charging station.
• Put it in hibernation mode on a Navimow, or power it off on a Mammotion.
• Store it somewhere dry that stays inside the maker’s range: 41°F and up for a Navimow, 14°F and up for a Mammotion.
• On a Mammotion, top it back up to 80% or more at least every 90 days.
• Never charge it while it’s below freezing.

For the whole winterizing routine, see how to winterize a robot mower.

How full should a robot mower be charged for winter?

From Navimow’s winter storage guides and Mammotion’s winter storage and battery maintenance support articles. Your model’s manual has the final word.

We say 85% for every brand. It’s the number on Navimow’s guides, it clears Mammotion’s 80%, and it’s one number to remember.

Check your charge limit first. Navimow’s and Mammotion’s apps both let you cap how full the battery charges, and plenty of owners set a lower limit for everyday mowing. If yours is below 85%, raise it before the last charge of the season, or the mower will stop short of what it needs for storage.

Turn off the mowing schedule too, so a scheduled start doesn’t wake it or send it out before you power it down.

Why 85%, and not full or half?

You’ll find “store lithium batteries at about half” all over the internet, and for a drill battery in a drawer it’s fair advice: a lithium pack ages a little faster sitting full than sitting at half.

A robot mower’s winter is different. It sits for four or five months, and a battery slowly loses charge on the shelf. Start that winter at half and there’s less room left above empty, and running all the way flat is what can damage a pack for good. So the makers set the storage charge at 80–85%: well clear of empty, without sitting at 100%.

That’s also why we stopped saying “about half” in our own guides.

Hibernation or power off: what’s the difference?

Navimow’s hibernation mode powers the mower off and uses less energy than a normal shutdown. That’s why Navimow’s guides list no winter top-up for a hibernating mower, only for one that isn’t. On an X4 it’s the Begin hibernating button on the app’s Winter storage screen (every tap is in the X4 checklist). To wake it in spring, charge it first, then power it on.

Mammotion has you take the mower off its charging station and power it off. There’s no hibernation step, so the battery needs a top-up during a long winter (below).

Does a robot mower need charging over the winter?

• Navimow in hibernation mode: Navimow’s guides list no top-up.
• Navimow not in hibernation: recharge it about every three months.
• Mammotion: top it back up to 80% or more at least every 90 days. Stored at the start of November, a LUBA needs a charge by the end of January, and it’s spring before the next one comes due.

To top up over the winter, set the charging station up indoors, plug it in, let the mower charge on it to 80–85%, then power it off again. Your manual shows how your model charges off the lawn.

How cold can a robot mower be stored?

• Navimow: between 41°F and 113°F (5°C to 45°C), somewhere dry and frost-proof. A basement or a heated garage or utility room is the place.
• Mammotion: between 14°F and 104°F (−10°C to 40°C). Below 14°F, Mammotion says the mower must come indoors.

An unheated garage works for a Mammotion in most of our service area, but most unheated garages in the North and Mid-Atlantic drop below 41°F in January, which is too cold for a Navimow. A shed is colder still.

When should the battery come out?

Only when the mower is wintering somewhere colder than its maker allows. Then:

• Take the battery out. On a Navimow X4 it’s a few Torx screws on the bottom, then the battery clips unplug.
• Store the battery inside, somewhere dry and above freezing, away from a furnace or space heater.
• Keep the mower dry and off the floor, and in its box if you still have it.

Stored indoors in the right range, the battery can stay in the mower.

Never charge a frozen battery

Charging a lithium battery while it’s below 32°F can damage the cells for good, and many battery packs refuse to charge that cold. If the mower or its battery spent time somewhere freezing (a cold shed, a car trunk, or a winter left outside), bring it inside and let it warm up to room temperature before it goes on the charger. Give it a few hours, and let any condensation dry off too.

Already left it out all winter? Here’s what to do.

In spring: charge it first

Whatever the brand, the first thing a stored mower gets in spring is a charge on its charging station. Then it gets fresh blades, a firmware check and a test mow. The spring startup has the order.

How long will the battery last?

Stored right every winter, a robot mower’s battery can outlast the mower on a smaller lawn. We ran the numbers by lawn size, and when a pack does fade, here’s what a replacement costs.

Get help with your robot mower

Zippy Lawnz is an authorized dealer and service center for Segway Navimow, Mammotion, Yarbo and Lopkin, with nationwide sales and remote support and hands-on service across Pennsylvania, New Jersey, Maryland, Delaware, Virginia, and Colorado. Zippy Lawnz customers can book a winterize visit and have us do all of this.

• 🤖 Register your mower in the app: My Mower keeps its maintenance plan, including a winterize reminder timed to your area’s typical first frost.
• 📞 Call or Text Us: 844-445-2969

In short: 85% on the dock · check the charge limit · hibernate (Navimow) or power off (Mammotion) · stored inside the maker’s range · Mammotion: top up every 90 days · never charge it frozen · in spring, charge first