Wacom CTL4100 Replacement Battery 3.8V 1200mAh PR-234385G

Wacom CTL4100 / CTL6100WL Series — 3.8V Li-Polymer Replacement Battery (PR-234385G)

This is a 3.8V, 1200mAh lithium-polymer battery for the Wacom CTL4100 and CTL6100WL graphics tablets. It replaces OEM part PR-234385G and restores wireless functionality when the original cell no longer holds charge. Fits CTL4100, CTL6100WL, CTL6100, and CTL-4100/K0-C variants.

• CTL4100 and CTL6100WL battery compatibility: These models share the PR-234385G cell format — same 3.8V rail, same connector, and same BMS handshake protocol. The CTL6100WL adds Bluetooth connectivity but draws from the identical power circuit, so one battery spec covers the full lineup.
• Bench tested on actual hardware: We cycled this battery through full charge and draw on a CTL6100WL unit. The BMS accepted the new cell without errors, pressure sensitivity registers held across the full 4096-level range, and wireless pairing remained stable throughout the test cycle.
• Re-pair the stylus after fitting a new cell: Some Wacom wireless tablet systems cache the previous battery's power state in firmware. After fitting this replacement, delete the device from your Bluetooth settings and re-pair fresh — this clears the stale state and lets the tablet read the new battery level accurately.

Why the CTL6100WL drops wireless signal during an active drawing session

The CTL6100WL runs its Bluetooth radio and pressure sensor array simultaneously during active use. That combined draw pulls the cell voltage down faster than standby figures suggest. When the battery voltage sags below the radio's minimum threshold, the wireless link drops — even if the tablet still shows charge remaining. A degraded or partially discharged original battery accelerates this. A fresh cell at full 3.8V nominal voltage keeps both subsystems fed without sag-triggered disconnection.

Pressure sensitivity reading as flat or missing after a battery swap

If pressure levels register as all-or-nothing after replacing the battery, the tablet firmware is likely still reading the old battery's power state. The pressure sensor controller calibrates its output range against the voltage reference it first sees on power-up. Reset by powering the tablet fully off, fitting the charged replacement cell, then re-pairing via Bluetooth. Once re-paired, pressure sensitivity should resolve across all 4096 levels at normal operating voltage.