MowRo Battery Replacement: When and How to Do It

Confirming It's Actually the Battery First

A MowRo that runs for a fraction of the time it used to, or won't finish a full mowing cycle without heading back to the dock early, points to a battery on its way out — but it's worth confirming that before spending money on a replacement, since a few other issues can look similar from the outside.

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Try This First (2 Minutes)

• Time a full charge-to-empty cycle and compare it to your mower's original rated runtime
• Check whether the mower is returning to the dock early on flat, easy terrain or only in specific tough spots
• Confirm the charging contacts are clean, since a poor connection can look like reduced runtime
• Note how old the battery actually is — most robot mower batteries have a realistic multi-year lifespan, not a permanent one

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Signs You Actually Need a Replacement

• Runtime has dropped noticeably compared to when the mower was new, even on a full charge
• The mower won't hold a charge overnight and shows near-empty again by morning
• The battery reaches full charge quickly but drains far faster than it used to during actual mowing
• The battery is several seasons old and was never fully depleted-and-recharged repeatedly, which shortens lifespan faster than normal use

If instead the mower won't charge at all — stuck at the base showing no progress — that's a charging contact, dock, or power supply issue, not necessarily the battery itself. Rule that out before assuming you need a new battery.

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Tools and Costs

• A genuine MowRo replacement battery, typically $60-120 depending on model
• A screwdriver matching your model's cover fasteners
• No specialized tools required for most MowRo models

Time: 15-25 minutes | Cost: $60-120 for the battery | Difficulty: Easy

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How to Replace the Battery

Safety note: Power off the mower completely before opening any cover or handling the battery. Never puncture, crush, or expose a robot mower battery to water.

Steps:

1. Power off the mower using the main switch and remove it from the dock
2. Locate the battery access cover per your model's manual — on most RM24 and RM18 units this sits under the top housing, secured with a few screws
3. Remove the fasteners and lift the cover away, keeping track of screw placement
4. Disconnect the old battery's connector, noting its orientation before removal
5. Remove the old battery and set it aside for proper disposal — most retailers or local hazardous waste programs accept old lithium battery packs
6. Install the new battery in the same orientation and reconnect the connector firmly
7. Replace the cover and fasteners
8. Power on and place the mower in the dock for its first full charge before running a mowing cycle

Time: 15-25 minutes | Cost: $60-120 for a genuine replacement | Difficulty: Easy

Model notes: RM24 and RM18 use a similar top-access battery layout, though exact screw count and cover shape differ slightly between the two — check your model's manual before starting if you're unsure.

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Should You Repair, Replace the Battery, or Replace the Whole Mower?

Given MowRo's budget-friendly pricing, it's worth doing the math before committing to a battery replacement. If the mower is several seasons old, has other wear showing (worn wheels, a tired blade motor), and a replacement battery costs a meaningful fraction of a new unit's price, a full replacement can sometimes make more financial sense than repair. If the mower is otherwise in good shape and the battery is the only issue, replacement is the clear choice.

Warranty check: If your MowRo is still within its warranty period, check whether battery replacement is covered before purchasing one yourself — some issues that look like normal battery aging turn out to be a covered defect.

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Prevent Premature Battery Wear

• Avoid letting the battery sit fully depleted for extended periods, especially over winter — see our MowRo winterizing guide for full storage prep
• Store the battery at room temperature rather than in an unheated shed during the off-season
• Avoid unnecessary full discharge-to-empty cycles when a partial top-off would do
• Keep charging contacts clean so the mower isn't working around a poor connection, which can look like battery wear even when the cell itself is healthy

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FAQ

How long should a MowRo battery actually last?

Most robot mower batteries hold up well for several full mowing seasons under normal use. Storage habits — especially winter storage — affect this more than day-to-day mowing does.

My MowRo won't charge at all. Is that the same problem as reduced runtime?

No — a mower that won't charge at all usually points to dirty contacts, a dock alignment issue, or the base station's power supply rather than the battery itself. Check those first.

Can I use a non-genuine replacement battery?

We recommend a genuine MowRo battery for guaranteed compatibility and safety. Third-party batteries vary widely in quality and may not match the mower's charging profile correctly.

Is it safe to replace the battery myself?

Yes, as long as the mower is fully powered off before you open any cover, and you handle the old and new battery packs carefully — avoid puncturing, crushing, or exposing either to water.

What should I do with the old battery?

Most retailers or local hazardous waste programs accept old lithium battery packs for proper disposal. Don't put it in regular household trash.

Does replacing the battery reset my boundary wire or schedule settings?

No — those are stored separately on the mower's control board and aren't affected by a battery swap.