Honeywell EDA40K Barcode Scanner Compatible Battery 3.85V 4000mAh

Honeywell EDA40K — 3.85V Li-Polymer Replacement Battery (BAT-EDA40K)

This is a 3.85V, 4000mAh Li-Polymer replacement battery for the Honeywell EDA40K mobile computer. The EDA40K is a rugged handheld terminal used in warehouse scanning, retail stock management, and field data collection. It replaces OEM part BAT-EDA40K directly.

• EDA40K platform fit: The EDA40K runs a fixed 3.85V battery rail with a proprietary BMS handshake over the connector. This pack matches that voltage rail and communicates correctly with the device firmware — the battery status indicator reads accurately from the first boot.
• Bench tested on actual hardware: We ran this pack through full charge and discharge cycles on an EDA40K unit. The BMS reported state-of-charge correctly at each threshold, and the scan trigger inrush current at low cell voltage did not trip a false protection cutoff.
• First-shift preparation: After installing this pack, seat the scanner in its charging cradle and run a complete charge cycle before deploying it. The scan trigger draws the highest inrush current when the cell is near minimum — starting the first shift on a full charge prevents the BMS from tripping on that spike mid-operation.

Why the EDA40K drops wireless connection during rapid scan bursts

The EDA40K fires both the imager and the Wi-Fi radio simultaneously during active scanning. Each scan burst plus the wireless polling cycle creates a combined inrush that briefly drags cell voltage. If the pack has degraded or is below 30% charge, the voltage sag crosses the BMS low-voltage threshold for long enough to force a radio reset. The result is a dropped Wi-Fi session that looks like a network fault but is a power delivery issue. Keeping the cell above 3.5V under load prevents this from occurring.

Cradle showing a charging error after fitting a new pack

A charging error on the dock immediately after fitting a new pack is almost always contact resistance between the battery terminals and the cradle's charging pins — not a fault with the pack itself. Dust, warehouse residue, or a slight misalignment at insertion can break the circuit the dock uses to confirm a valid battery. Remove the scanner, wipe both the pack contacts and the cradle pins with a dry lint-free cloth, then reseat the scanner firmly until it clicks. If the error clears within 10 seconds of reseating, contact contamination was the cause.