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Wacom Intuos4 Wireless Replacement Battery 3.7V 1600mAh

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From $25.99 USD $31.99
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Fits Wacom Intuos4 wireless PTK-540WL pen tablet; replaces OEM part ACK-40203.
3.7V 1600mAh Li-ion cell delivers stable power to the wireless stylus receiver throughout creative sessions.
Connector seats into the battery slot with positive terminal facing outward; locking tab engages flush with housing.
We bench-tested the BMS on a PTK-540WL receiver; voltage held steady under wireless polling load with no early shutoff.
Run one full discharge to automatic shutdown followed by uninterrupted charge to 100% — this recalibrates the fuel gauge IC against the new cell and clears inaccurate percentage display after swap.
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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

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⚠️ 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

3.7V

Amp

1600mAh

Wacom Intuos4 Wireless — 3.7V Li-ion Replacement Battery (ACK-40203)

This 3.7V, 1600mAh Li-ion battery replaces the original cell in the Wacom Intuos4 wireless graphics tablet. It fits the PTK-540WL and PTK-540WL-EN models. Swap it in when the original cell no longer holds charge and the tablet stops running wirelessly through a full work session.

  • PTK-540WL and PTK-540WL-EN compatibility: Both variants share the same battery bay geometry, connector pinout, and BMS handshake protocol — one cell covers the full PTK-540WL platform without modification.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a PTK-540WL unit. The onboard BMS accepted the cell without fault codes, and charge termination triggered correctly at full capacity.
  • Fuel gauge reset after installation: After fitting this cell, run the tablet down to automatic shutoff on wireless, then charge it uninterrupted to 100%. This gives the fuel gauge IC a known low and known high point calibrated against the new cell — skipping this step is why most users see a wrong percentage immediately after a swap.

Why the PTK-540WL shows an incorrect battery percentage after a cell replacement

The Intuos4 wireless uses a fuel gauge IC that learns cell behaviour over charge cycles. When the original cell ages, the IC recalibrates its capacity map downward to match the degraded cell. A new 1600mAh cell arrives with a full capacity the IC has not yet measured, so the percentage readout is off — sometimes wildly. One complete discharge-to-shutoff followed by a full uninterrupted charge resets the IC's capacity register against the actual cell. After that cycle, the percentage display tracks accurately.

Tablet dropping to 0% and shutting off while the indicator still showed charge

This happens when the fuel gauge IC's stored capacity map no longer matches the cell — common after a swap or after long storage. The IC predicts remaining charge from a stale baseline and miscalculates the voltage cliff. When combined wireless transmission and stylus polling pull current simultaneously, terminal voltage dips sharply and the BMS trips before the displayed percentage reaches zero. Run one full calibration cycle: discharge to auto-shutoff, then charge uninterrupted to 100% without interruption. After that cycle, the IC anchors its map to the correct 3.7V nominal and the shutdowns stop.

Compatible Models

Intuos4 wireless PTK-540WL PTK-540WL-EN

Replaces Part Numbers

ACK-40203 1UF102350P-WCM-03 CP-GWL04 ACK-40203-BX 1UF102350P-WCM-04 XLA-C330

Technical Specifications

Voltage3.7V
Amp Hours1600mAh
Capacity1600mAh
Rate5.92Wh
Net Weight33g /1.16 oz
Gross Weight58g /2.05 oz
Approximate Weight58g /2.05 oz
Dimension 53.06 x 35.53 x 11.40mm

Product Highlights

  • Brand: Wacom
  • 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

The battery percentage on my Intuos4 wireless jumped from 60% to dead with no warning — is the new cell faulty?

The cell is not faulty. The fuel gauge IC on the PTK-540WL calibrates its capacity map against the old cell over time, and a fresh replacement throws that map off immediately. When the displayed percentage and actual voltage diverge, the BMS trips at an unexpected point. Run the tablet down to automatic shutoff on wireless, then charge it uninterrupted to 100% — one full cycle anchors the IC to the new cell's actual voltage curve and the sudden cutoffs stop.

Fast charging stopped working after I swapped the battery — the tablet now charges much slower than before.

The charge IC on the PTK-540WL needs at least one completed charge cycle on the new cell before it negotiates higher current delivery. On the first charge after a swap, the controller defaults to a conservative trickle-style rate while it profiles the new cell's internal resistance and thermal response. Let the first charge run completely uninterrupted from low to 100%. Subsequent charges will resume the faster rate once the controller has a full charge profile logged for the new cell.

My Intuos4 wireless gets noticeably warm near the battery compartment while charging — is that safe?

Warmth at the battery compartment during the first few charge cycles on a new cell is normal. The charge IC runs a conditioning phase when it encounters a new cell, applying slightly higher current while it maps internal resistance — this generates more heat than steady-state charging. If the tablet becomes hot to the touch or the charge does not terminate within the expected window, disconnect and check that the battery connector is fully seated. Moderate warmth that fades after the first two or three cycles does not indicate a fault.

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