Worx WX156 20V MAX Replacement Battery 16V 2000mAh Li-ion
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Worx WX156 20V MAX Replacement Battery 16V 2000mAh Li-ion - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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
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
⚠️ 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.
Worx WX156 20V MAX Replacement Battery 16V 2000mAh Li-ion - is backordered and will ship as soon as it is back in stock.
Voltage
16V
Amp
2000mAh
Worx WX373 Brushless Impact 20V MAX Drill — 16V Li-ion Replacement Battery (WA3527)
This is a 16V, 2000mAh (32Wh) Li-ion battery for the Worx Brushless Impact 20V MAX Drill. It fits the WX373, WX152, and related models that use the WA3527 or WA3539 battery pack. Slot it in where your original pack sits and you're back to full cordless operation.
- WX373 and WX152 platform fit: These models share the same 16V battery rail, slide-in connector, and BMS handshake protocol. The pack communicates cell state to the tool's motor controller, so the replacement must match the original voltage profile — this one does.
- Bench tested on actual hardware: We ran this pack through the WX373 charger cycle and monitored the BMS through charge termination. The protection circuit responded correctly to inrush current on trigger pull and held voltage within spec under sustained torque load.
- Motor-start conditioning on first use: On first use, run the drill at half load for two cycles before pushing maximum torque. This allows the BMS to log the motor's inrush current signature before it locks in overcurrent thresholds — reducing the chance of a nuisance trip on hard starts.
BMS cutoff on motor-start inrush during hard drilling
The WX373 brushless motor draws a sharp current spike the instant the trigger is pulled — especially when driving into dense material or using large-diameter bits. If the BMS hasn't profiled that inrush yet, it can read the spike as an overcurrent fault and cut power immediately. This isn't a defective battery. The protection circuit is doing its job. Running two lighter cycles first gives the BMS a baseline, so full-torque pulls no longer trip the threshold.
Charger blinking red on a new pack that's been in storage
Li-ion cells self-discharge during storage. If the pack drops below roughly 2.5V per cell, most chargers — including the Worx standard charger — will refuse to begin a charge cycle and signal a fault with a blinking red LED. The charger isn't broken and neither is the battery. To recover it, use a charger with a recovery or wake-up mode, or briefly apply a trickle current until cell voltage climbs above the 2.8V acceptance threshold. Once the pack is above that floor, the standard charger will take over and complete the cycle normally.
Compatible Models
Replaces Part Numbers
Technical Specifications
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 WX373 cuts out the instant I pull the trigger on a tough screw — is the battery tripping?
Yes — that's a BMS overcurrent trip triggered by the motor's inrush current spike on a hard start. The protection circuit sees the surge before it has a baseline for your motor and shuts the pack down as a precaution. Run the drill at half load for two cycles first so the BMS can profile the inrush draw. After that, full-torque trigger pulls should stop tripping the cutoff.
The drill feels weak and bogs down mid-hole even with a charged battery — what's happening?
That's voltage sag under load — the rail voltage drops because contact resistance between the battery terminals and tool contacts has increased. Clean the battery slide contacts and the tool's contact rails with a dry cloth or light contact cleaner, then reseat the pack firmly. If the bogging persists, check that the contacts aren't bent or recessed; even a 0.2Ω increase in contact resistance causes a measurable voltage drop under motor load.
The battery performs noticeably worse on cold mornings — is something wrong with it?
Nothing is wrong. Li-ion internal resistance rises sharply below 5°C, which reduces how much current the cells can deliver without the voltage sagging below the tool's cutoff point. Bring the pack indoors and let it warm to room temperature before use — 20 minutes at 18–20°C is enough. If you're working in sustained cold, keep a second pack warm in a jacket pocket and rotate them to maintain usable cell temperature.
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