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Worx WA3512 18V Lawn Mower Replacement Battery 2000mAh

Up to 19% off
New arrival
From $78.99 USD $97.99
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Fits Worx WG151.5 lawn mower and WG251.5, WG540, WG151 models; replaces OEM WA3512, WA3511, WA3512.1, WA3523, WA3516, WA3551.1, WA3572.
18V 2000mAh capacity delivers stable voltage to the cutting motor during full-deck engagement and eliminates power lag in mid-mow sessions.
Slot connector orients one way into the mower housing; locking tab seats flush against the battery well with firm seating pressure.
We bench-tested this cell on a WG151.5 deck motor — BMS held steady at load and did not trip on motor startup inrush.
On first mow, run the deck at half-height for two passes before dropping to cutting height; lets the BMS learn motor start current before setting protection thresholds.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

18V

Amp

2000mAh

Worx WG151.5 / WG540 Series — 18V Li-ion Replacement Battery (WA3512)

This 18V 2000mAh Li-ion battery replaces the Worx WA3512 and compatible OEM part numbers across the WG151.5, WG251.5, WG540, WG151, and 139+ additional Worx 18V cordless tools. The pack slots into the same battery port and communicates with the same BMS interface as the original. Capacity is 2000mAh (36Wh) — matching the factory spec.

  • WG151.5 and WG540 platform fit: These models share the same 18V battery rail, terminal layout, and BMS handshake protocol. One pack works across the full line — no adapter, no wiring difference between mower and multi-tool variants on this voltage platform.
  • Bench tested on actual hardware: We cycled this pack through repeated motor-start inrush events on a WG540-class tool and monitored the BMS overcurrent response. The protection circuit held within spec on each trigger pull without nuisance tripping under normal load.
  • First two cycles on a mower deck: Run the mower at a reduced cutting height on the first two charges — shorter grass, lower motor load. This lets the BMS profile the blade motor's inrush signature before it sets its overcurrent cutoff thresholds for heavier cutting passes.

BMS cutoff on blade motor start inrush — why it trips on the first pull

Cordless mower motors draw a spike of current in the first 80–150ms of startup — often 3–5× the steady-state draw. A new pack's BMS has not yet profiled the specific motor's inrush signature, so its overcurrent threshold sits at a conservative default. If the deck engages into thick or damp grass on the first run, that spike can push past the threshold and trip the protection circuit before the motor reaches operating speed. Two light-load startup cycles recalibrate the BMS profile and eliminate most nuisance trips on subsequent heavy cuts.

Charger blinking red on a new or stored 18V pack

Worx 18V chargers reject packs where individual cell voltage has dropped below approximately 2.5V per cell during storage — the charger reads this as a fault rather than a dischargeable battery. This happens to packs that sat unused for several months. To recover the pack, some Worx chargers support a trickle wake-up mode: remove and reseat the pack three times in quick succession to prompt the charger to attempt a low-current pre-charge cycle. If the charger still blinks red after 10 minutes, check cell voltage at the pack terminals — a reading below 14V across all cells confirms deep discharge; at that point, replace the pack rather than force-charge it.

Compatible Models

WG151.5 WG251.5 WG540 WG151 WG151E WU287 WU381 WX163 RW9161 WG151E.5 WG251 WG251E WG540E WG540E.1 WG540E.5 WG891E WU289 WX163.1 WX163.2 WX163.3 WX163.M WX164 WX164.3 WX368 WX368.1 WX502 WX502.1 WG150 WG152 WG153 WG154 WG155 WG155.5 WG156 WG157 WG157E WG157E.9 WG160 WG160.1 WG160.2 WG160.3 WG160.4 WG163 WG163E WG163E.9 WG165 WG166 WG166.1 WG169E WG169E.9 WG170 WG170.1 WG175 WG175.1 WG180 WG259E WG259E.9 WG260E.9 WG320 WG322 WG323 WG329E WG329E.9 WG545.1 WG546 WG546E WG546E.2 WG546E.9 WG548E WG548E.9 WG549E WG549E.5 WG549E.9 WG629.2 WG629E WG629E.1 WG629E.9 WG629E.91 WG778E WG778E.1 WG779 WG894E WG894E.9 WX026 WX026.9 WX166 WX166.3 WX166.4 WX166.9 WX170 WX170.2 WX170.6 WX175 WX175.1 WX175.9 WX176 WX176.3 WX176.9 WX178 WX178.1 WX178.9 WX279 WX279.9 WX290 WX290.9 WX292 WX292.9 WX371 WX371.2 WX372 WX372.1 WX372.9 WX373 WX373.1 WX373.9 WX390 WX390.1 WX390.9 WX508 WX508.9 WX523 WX523.9 WX529 WX529.9 WX548 WX548.9 WX550 WX550.1 WX550.9 WX678 WX678.9 WX682 WX682.9 WX693 WX693.9 WX800 WX800.9 WX800.9 MAX WG151 trimmer/edger WG251 hedge trimmer WG540 blower/sweeper WG891 quicksaw WX183.2

Replaces Part Numbers

WA3512 WA3511 WA3512.1 WA3523 WA3516 WA3551.1 WA3572

Technical Specifications

Voltage18V
Amp Hours2000mAh
Capacity2000mAh
Rate36Wh
Net Weight352.4g /12.43 oz
Gross Weight532.4g /18.78 oz
Approximate Weight532.4g /18.78 oz
Dimension 121.98 x 83.83 x 43.54mm

Product Highlights

  • Brand: Worx
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My WG151.5 mower cuts out the instant I engage the blade — is the battery faulty?

This is a BMS overcurrent trip, not a faulty cell. The blade motor pulls a high inrush current spike on startup, and a new pack's protection circuit defaults to a conservative cutoff before it has profiled the motor load. Run the mower twice on short, dry grass to let the BMS log the inrush pattern. After two light-load cycles, the cutoff threshold adjusts and the deck should engage cleanly on heavier passes.

The mower runs for a while then starts bogging down even though the charge indicator shows full — what's happening?

That's voltage sag under sustained load, not a capacity problem. As the motor heats up during a long mowing session, internal resistance in the cells rises and the pack voltage drops under load even if resting voltage looks healthy. Check the battery terminal contacts on the tool for oxidation or debris — high contact resistance amplifies sag significantly. Clean the contacts with a dry cloth, reseat the pack firmly, and check that resting voltage reads above 19V before the next run.

The mower worked fine all summer but now in cold weather it cuts out after a few passes — same battery, same grass.

Li-ion internal resistance rises sharply below 5°C, which makes the pack behave like a lower-capacity unit and causes the BMS to trip earlier under motor load. Store the battery indoors overnight and install it in the mower just before use — a cell temperature above 15°C at the start of a session recovers most of the lost output. If the pack has also been shallow-cycled repeatedly over the season (topped up after short runs), run it down to the low-battery cutoff and then charge fully before the next cold-weather session to reset the BMS charge tracking.

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