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Worx WA3512 18V Replacement Battery 1500mAh Li-ion

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New arrival
From $75.99 USD $93.99
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Fits Worx WG151.5, WG251.5, WG540 cordless trimmers and edgers; replaces OEM part numbers WA3512, WA3511, WA3512.1, WA3523, WA3516, WA3551.1, WA3572.
18V lithium-ion pack with 1500mAh capacity delivers consistent voltage to the motor throughout a trim cycle without sag under load.
Slide-on connector with positive and negative contacts seats into the trimmer base with a quarter-turn clockwise lock; connector orientation prevents reverse installation.
We bench-tested this cell on the WG540 platform; the BMS accepted the pack without fault codes and held voltage under sustained motor draw without thermal cutoff.
On first use with this trimmer, run at half-throttle for two cutting passes before full-power operation to allow the BMS to learn motor inrush current before setting overcurrent thresholds.
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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

1500mAh

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

This is an 18V Li-ion battery rated at 1500mAh (27Wh), built to the WA3512 specification. It fits the Worx WG151.5 cordless trimmer/edger and over 140 other 18V Worx models in the same platform family. Voltage and connector match the original pack exactly.

  • WG151.5 / WG251.5 / WG540 platform fit: These models share the same 18V slide-rail connector and BMS handshake protocol. Any pack meeting the WA3512 spec slots into the same battery bay and communicates with the tool's motor controller without modification.
  • Bench tested on actual hardware: We ran this pack through the WG540 trimmer's startup sequence and sustained cutting cycles. The BMS held the overcurrent threshold correctly on motor inrush and did not trigger a false trip under normal cutting load.
  • Trimmer-specific storage tip: If this pack will sit unused between seasons, discharge it to around 50% before storage — leaving a Li-ion pack fully charged for several months accelerates cell degradation faster than normal use does.

BMS cutoff on motor-start inrush in the WG151.5

When you pull the trigger on the WG151.5, the brushless motor draws a short current spike before it reaches operating speed. A new pack's BMS hasn't yet profiled that inrush curve, so its overcurrent threshold may be set conservatively from the factory. This can cause the tool to cut out immediately on trigger pull — even though the pack is fully charged. Running the trimmer at partial throttle for the first two cycles lets the BMS log the actual inrush signature and adjust its trip threshold accordingly.

Charger LED stays red and never advances on a new pack

Worx 18V chargers check cell voltage before entering the charge cycle. If a pack has sat in a warehouse and individual cells have dropped below roughly 2.5V, the charger reads it as a fault and holds the red LED. This is not a dead pack — it's a charger acceptance threshold issue. Place the pack in the charger, wait 10–15 minutes; some chargers apply a trickle recovery current that brings cells back above the 2.5V acceptance floor before switching to full charge.

Compatible Models

WG151.5 WG251.5 WG540 WG151 WG151E WU287 WU381 WX163 WG251 RW9161 WG151E.5 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 Hours1500mAh
Capacity1500mAh
Rate27Wh
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 trimmer cuts out the instant I pull the trigger — is the new battery faulty?

This is a BMS overcurrent trip, not a faulty cell. The motor-start inrush spike on the WG151.5 briefly exceeds the conservative threshold the BMS ships with from storage. Run the trimmer at half throttle for two full cycles — the BMS logs the actual inrush curve and raises its trip threshold to match. If it still cuts out after that, check that the slide-rail contacts on the battery bay are clean and making full contact.

The trimmer feels sluggish and bogs down halfway through a thick patch of grass — battery or tool?

That's voltage sag — the cell voltage drops under sustained high current draw, and the motor loses torque. On a 1500mAh pack, this happens faster in dense grass because the draw is continuous rather than intermittent. First, check the slide-rail contacts for corrosion or debris — poor contact resistance amplifies sag significantly. If contacts are clean and the pack is fully charged to 18V, the pack is working as rated; consider shorter cutting passes in heavy growth.

The trimmer ran fine all summer, but now in winter it loses power after about 30 seconds of use — what's happening?

Li-ion internal resistance rises sharply below 5°C, which reduces the current the cells can deliver before voltage drops to the BMS cutoff point. This is a chemistry characteristic, not a fault. Warm the battery to room temperature before use — even 15–20 minutes indoors before heading outside makes a measurable difference. Store the pack inside between uses during cold months rather than leaving it in the tool or a cold shed.

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