Zebra WT41N0 Replacement Battery 3.7V 2200mAh Li-ion

Zebra WT41N0 / WT4090 / WT4000 — 3.7V Li-ion Replacement Battery

This 3.7V 2200mAh Li-ion battery fits the Zebra WT41N0, WT4090, and WT4000 wearable mobile computers. These devices run in warehouse pick-and-pack lines, logistics hubs, and retail stockrooms where the battery takes constant, repetitive load from barcode scanning and wireless communication. Capacity is 8.14Wh — matched to the original cell specification for these units.

• WT41N0, WT4090, WT4000 platform fit: All three models share the same battery bay geometry, 3.7V nominal rail, and BMS communication protocol. A single cell design covers the platform without requiring different connectors or firmware handshake adjustments.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on WT41N0 hardware. The BMS accepted the cell without fault codes, balanced the charge correctly, and the device reported accurate state-of-charge throughout the cycle.
• First-shift prep for pick-and-pack use: After installing, seat the scanner in its charging cradle and run a full charge cycle before the first shift. Scan trigger inrush current peaks when the cell is near minimum — a fully charged pack prevents false BMS trips when the trigger is hammered hard in the first hour of use.

Why the WT41N0 drops its wireless connection during rapid scan bursts

The WT41N0 fires both the imager and the 802.11 radio simultaneously during active scanning. That combined draw creates a current spike that a degraded or low cell struggles to sustain above the BMS undervoltage threshold. When the cell voltage sags below that threshold mid-burst, the BMS cuts output momentarily — the radio drops its access point association and the scan misses the acknowledgment. A fresh cell at full charge holds the voltage rail stable through those combined spikes and keeps both the imager and radio live.

Cradle showing a charging error immediately after installing a new pack

This error almost always comes from contact resistance at the battery terminals, not a fault in the cell. Dock contacts and battery gold pads accumulate oxidation and debris in active warehouse environments, and even a thin layer adds enough resistance that the cradle's charge controller reads an abnormal handshake. Pull the battery, wipe the gold contacts on both the pack and the dock with a dry lint-free cloth, reseat firmly, and check that the pack clicks into the locking tab. If the error clears, the cell is fine — if it persists after clean contacts, check the cradle voltage output at the terminals, which should read 4.2V under no-load.